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What does 'prego' mean?

in Portuguese is diferent ... when you use hammer you need "prego" for to hammer.

it's also the word you use when you pass sth. to so. e.g. if a person at the table reachs the cheese to you, he will say "Prego!" as for "here you are!". You can reply with "Grazie!". Here you can see that prego and grazie always stick together, (also inverted in the sequence) the one of the reply to the other.