Which Brazilian Portuguese phrase fooled you when you translated it word for word?
Imagine walking into a shop in Brazil and approaching the counter. The attendant looks up and says:
>Pois não?
If the word you recognise is não, you might think you've been turned down before you've even asked for anything.
Here, the attendant is inviting you to speak. Think How can I help you? You might hear it after getting someone's attention with Com licença, or when they notice you waiting. It's a polite way to acknowledge you and give you the floor.
Now you've chosen a present and want it gift-wrapped:
>You: Pode embrulhar para presente?
>
>Shop assistant: Pois não!
Your question means Can you gift-wrap it? The answer means Of course or Certainly. This time, pois não accepts a request that has already been made.
The first use opens the conversation; the second agrees to help. Neither is a refusal. The expression works as a whole, and its place in the conversation helps you interpret it.
Another one I like is imagina. You thank someone for helping you:
>You: Obrigado pela ajuda!
>
>Other person: Imagina!
Translated word for word, their answer is Imagine! Here, it does the work of Don't mention it or No problem, gently treating the favour as something you don't need to thank them for.
Is there a Brazilian Portuguese expression that caught you out like this? What did you initially think it meant, and what was happening when you heard it?