Below are possible answers for the crossword clue One-up.
5 letter answer(s) to one-up
OUTDO
be or do something to a greater degree;
get the better of; "the goal was to best the competition"
8 letter answer(s) to one-up
OUTSMART
beat through cleverness and wit; "I beat the traffic"; "She outfoxed her competitors"
defeat by more skillful maneuvering; "The English troops outmaneuvered the Germans"; "My new supervisor knows how to outmaneuver the boss in most situations"
To do better. To out think.
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