Definition of one-up
transitive verb
:to practice one-upmanship on
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Origin and Etymology of one-up
back-formation from one-upmanship
one up
adjective
Definition of one up
:being in a position of advantage
—usually used with on
First Known Use of one up
1919
ONE-UP Defined for English Language Learners
one up
adjective
Definition of one up for English Language Learners
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: having an advantage over someone : in a position that is better than someone else's position
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