to give a hand, to help out
Será que você pode me dar uma mãozinha aqui para carregar estas caixas?
Could you give me a hand here to carry these boxes?
The image behind dar uma mão ("to give a hand") is wholly transparent: lending someone your hand to share the effort of a task. The same metaphor, where the hand stands for practical help, appears across many European languages, so the Portuguese phrase has no single documented origin — it simply draws on the everyday gesture of physically helping.
Falando's Idiom Trainer teaches you to recognize idiom meanings and create sentences using them, so you can speak like a Brazilian.
