ad in

ad in

In tennis, a shortening of "advantage in," meaning the server has the advantage and will win the next point after deuce. The score is ad in because Tiffany is serving, and she has the advantage. The score is tied, wait, no, now it's ad in for the player from Switzerland. It's ad in, so Joe, the server, will win the game if he scores the next point.
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Farlex Dictionary of Idioms. © 2022 Farlex, Inc, all rights reserved.
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