Re: What does ’hand’ mean here?
I think it's alluding to a game of cards. Your "hand" refers to the cards you have in your hand to play the game with. Sometimes you have good cards and sometimes you don't. If you do, then you have a "good hand". The metaphor being used is that the person speaking is saying that the other person's hand is so good that it would cause another player to "fold" - to throw in their cards without bothering to play because they are sure they will lose.
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