To grab a bite / to chow down
Vamos bater um rango antes do filme?
Shall we grab a bite before the movie?
Bater um rango means "to grab a bite / have a meal," where rango is slang for food or grub. The verb bater ("to hit") is used loosely here, as in many casual Brazilian phrases, to mean "knock out" or "get done" — so bater um rango is roughly "to knock back a meal."
Falando's Idiom Trainer teaches you to recognize idiom meanings and create sentences using them, so you can speak like a Brazilian.