“Pay up!”
You made a bet with your friend about a baseball game. You just won the bet, so you shout this to get him to pay you the money he owes you.
Pay up!
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Pay up!
This is a phrase that you say to make a friend pay you after you win a bet. If you used it with people you don't know well, or with your friends in other situations, it might seem rude. But it's a perfect phrase for friendly bets.