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Origin of one up
Definition for one up (2 of 2)
verb (used with object), one-upped, one-up·ping.
Origin of one-up
British Dictionary definitions for one up
Idioms and Phrases with one up
Having an advantage or lead over someone, as in Sara is one up on Jane because she passed algebra in summer school. This expression comes from sports, where it means to be one point ahead of one's opponents. It was transferred to more general use about 1920.