Drop it / let it go
Larga mão dessa briga, não vale a pena.
Drop this fight, it's not worth it.
A literal phrase: largar mão de = to let go of [something held]. In informal Portuguese it has long meant 'drop the matter, let it go.
Falando's Idiom Trainer teaches you to recognize idiom meanings and create sentences using them, so you can speak like a Brazilian.