a battle of giants, big league fight
Eu não quero estar envolvido em briga de cachorro grande.
I don't want to be involved in a battle of giants.
The expression briga de cachorro grande ("big dogs' fight") rests on a familiar barnyard scene: when large, powerful dogs go at each other, the clash is fierce and a smaller animal that wanders in only gets hurt.
Falando's Idiom Trainer teaches you to recognize idiom meanings and create sentences using them, so you can speak like a Brazilian.
