to leave, to hit the road
Já tá muito tarde, vou pegar o beco.
It's already very late, I'm going to hit the road.
A common expression in the North and Northeast, referring to ducking into an alley (beco, a narrow street) to leave quickly or slip away unnoticed.
Falando's Idiom Trainer teaches you to recognize idiom meanings and create sentences using them, so you can speak like a Brazilian.