one up: Meaning and Definition of

one' up'

1. having gained an advantage in some way that betokens success, esp. over rivals.
2. leading an opponent by one point or one scoring unit: The home team was one up on the visitors.
3. one each; tied at a score of one: The score was one up in the ninth inning.
4. with only one reproduction of a form per sheet or on a given sheet: We must print this job one up.
5. using one more column of space than of type.

one-up

1. to get the better of; succeed in being a point, move, step, etc., ahead of (someone): They one-upped the competition.