For those who think young sloganeer once / WED 7-28-21 / Signal that a reply is coming in a messaging app / Be motto for wikipedia contributors / Noted colonial pamphleteer / Diatribe trigger / Remove from danger informally

Constructor: Alex Rosen and Brad Wilber

Relative difficulty: Medium (maybe a little tougher)

THEME: DRIBBLE-ing (39A: Make art like 53-/21-Across (as suggested by this puzzle's circled letters?)) with JACKSON / POLLOCK (53A: With 21-Across, artist known to 39-Across pigments back and forth onto canvases) — you can find the letters P, A, I, N, T (in circled squares) DRIBBLEd "back and forth" inside of four answers (well, "back" (reversed) inside one Across and one Down themer, and "forth" (in correct order) in their symmetrical counterparts):

The PAINT answers:

• PETUNIA PIG (17A: Porky's significant other)
• PADDINGTON (61A: ___ station, Central London railway terminal)
• UP TO A POINT (11D: Somewhat)
• TENNIS CAMP (29D: Where you might find love away from home?)

the back-and-forth "PAINT"

Word of the Day: RED BUD (50A: Oklahoma's state tree) —

Cercis canadensis, the eastern redbud, is a large deciduous shrub or small tree, native to eastern North America from southern Michigan south to central Mexico, east to New Jersey. Species thrive as far west as California and as far north as southern Ontario, roughly corresponding to USDA hardiness zone 6b. It is the state tree of Oklahoma. // The eastern redbud typically grows to 6–9 m (20–30 ft) tall with an 8–10 m (26–33 ft) spread. It generally has a short, often twisted trunk and spreading branches. A 10-year-old tree will generally be around 5 m (16 ft) tall. The bark is dark in color, smooth, later scaly with ridges somewhat apparent, sometimes with maroon patches. The twigs are slender and zigzag, nearly black in color, spotted with lighter lenticels. The winter buds are tiny, rounded and dark red to chestnut in color. The leaves are alternate, simple, and heart shaped with an entire margin, 7–12 cm (3–4.5 in) long and wide, thin and papery, and may be slightly hairy below. // The flowers are showy, light to dark magenta pink in color, 1.5 cm (1⁄2 in) long, appearing in clusters from spring to early summer, on bare stems before the leaves, sometimes on the trunk itself. There are cultivars with white flowers. The flowers are pollinated by long-tongued bees such as blueberry bees and carpenter bees. Short-tongued bees cannot reach the nectaries. The fruit are flattened, dry, brown, pea-like pods, 5–10 cm (2–4 in) long that contain flat, elliptical, brown seeds 6 mm (1⁄4 in) long, maturing in August to October.

• • •

Like Sunday's constellation puzzle, this puzzle is trying to do a lot. You've got the artist's name, the alleged technique he uses (DRIBBLE) and then the "PAINT" gimmick, where the letters can be found in forward and reversed order inside the themers (a back-and-forth set of Acrosses, a back-and-forth set of Downs). It was the discovery of the "back-and-forth" thing, the precision of it, that warmed me to this puzzle a little bit at the end. Before that, I wasn't paying too much attention, and it felt like the letters in PAINT were just mixed up / scrambled, i.e. appearing in random order. This is probably because the first themer (PETUNIA PIG) has them backwards and so when I noticed PAINT was involved (inside PADDINGTON), I didn't see PAINT reversed, I just saw "the letter in PAINT out of order." But no, there is a definite "double DRIBBLE" (which ... thank you, puzzle, for laying off the basketball pun). PAINT goes forward, PAINT goes back, etc. Before noticing this little detail, I was put off by a couple of things. First, the very word DRIBBLE, which feels simplistic and reductive. DRIBBLE sounds unskilled or else accidental. You DRIBBLE your drink down the front of your shirt if you're clumsy or inebriated or whatever. A baby DRIBBLEs on its bib. I'm sure it's a word that's been used for his technique, but it looks like his technique is generally called the "drip technique," and splashing is another purposeful verb that's been used. I get that the letters in PAINT represent drops of paint, and that maybe DRIBBLE conveys the idea of droplets well, but the word felt almost condescending to me in its oversimplification. Also, JACKSON / POLLOCK never threw paint in such an orthogonal way. The crossword puzzle grid is maybe not the best medium for imitating POLLOCK—it's all right angles, all orderly and precise. If you look at a POLLOCK ... well, here, just look at a POLLOCK:

"Number 48"

But as I say, the back-and-forth element won me over somewhat by the end. Oh, I also did not at all like all the cross-references in the clues for the artist and DRIBBLE, or the fact that the last name comes first (i.e. POLLOCK is up top while JACKSON is below), so his name is out of order and so you have to go down to the bottom of the grid and hunt for the 53-Across clue if you want to begin to understand 21- or 39-Across (a thing I stubbornly refuse to do). This makes the solve feel a bit fussy, awkward, clumsy. Outside the theme, I had some trouble. Because DRIBBLE was unknown to me for a while, I had trouble with the whole middle, especially SWABBIE (!?), which is a word maybe I've heard, but it feels very slangy / informal (25D: Low-ranking sailor). In fact, it is slang. It should really be clued as slang (I had a similar feeling that BFFS should be clued as an abbr., but BFFS is what people actually say, so maybe it can stand on its own with just a slang word in the clue ("buds") tipping us off to its slanginess) (1A: Buds that are very close). In that same DRIBBLE / SWABBIE area, I also had trouble with BOAR (44A: Male hedgehog) and BOLD too (not a fan of the fill-in-the-blank clues for either BOLD or ONLY, neither of which meant anything to me). 

Had RED ___ and no idea what the rest of the tree was (50A). I know only RED OAK (New Jersey!) and maybe RED FIR (or am I thinking "red fern"?), but BUD, no, that was not on my list of possibilities. See also TENNIS ___, where I was out of ideas after TENNIS COURT (for most of us, the TENNIS COURT is, in fact, "away from home"). Never heard of ROCK COD (just "cod," maybe "Atlantic cod"), but strangely I never even saw the clue for that one, so I can't say it bothered me or held me back. For as dense as the theme was, the fill was alright. I watched EPEE last night (Olympics!) so the "touch" reference in the clue was instantly clear to me (16A: Sports event in which athletes try to avoid being touched). Weird that OIL didn't get folded into the theme somehow (would've preferred that to this punny "strikes?" business) (47A: Industry that encourages strikes?). Overall, an interesting, ambitious, mostly successful endeavor.

Signed, Rex Parker, King of CrossWorld

[Follow Rex Parker on Twitter and Facebook]