I take my hat off to somebody (also hats off to somebody) is used to say you admire someone very much because of what they have done. 

I take my hat off to Ian – without him, we’d have never finished this project on time.

I take my hat off to Mr. Clarke for taking this action. 

I was impressed by that. You have to take your hat off to the guy. 

Tradução: tiro o chapéu para você, dou os meus parabéns.