Green’s Dictionary of Slang

press v.

(UK black/gang) to provoke conflict, to threaten.

[UK]T. Thorne (ed.) ‘Drill Slang Glossary’ at Forensic Linguistic Databank 🌐 Pressing - initiating conflict, pressuring, threatening.

SE in slang uses

In phrases

press the ether (v.)

(US black) to play music.

[US]L. Durst Jives of Dr. Hepcat (1989) 5: Just as soon as the canary pulls her number, the combo breaks out like the measles and presses much ether.
press the flesh (v.)

(orig. US) usu. of a politician on a campaign tour to meet the electors, to shake hands; thus press-the-flesh adj., ingratiating, insincere, oleaginous.

[US]Maines & Grant Wise-crack Dict. 8/1: Press the flesh, shake hands.
[UK]A.E.W. Mason Sapphire 16: ‘Press the flesh,’ said I, extending my hand [OED].
[US]Life 2 Sept. 12: The President patently was out to "press the flesh" and get himself plugged back in with the populace.
[US]Time 6 Nov. 58: A diffident public speaker who prefers to press the flesh with individual voters.
[US]N. Thornburg Cutter and Bone (2001) 120: Grinning and pressing the flesh like any other good ole boy.
[UK]N. Palmer ‘Vegan Reich’ in Home Suspect Device 18: Tina was far better suited to the flesh-pressing side of things.
[UK]J. Baker Walking With Ghosts (2000) 83: He gave Wimp his right hand, said, ‘Press the flesh, my man’.
[UK]Indep. 25 Feb. 3: He’s out pressing the flesh with the voters of London.