One-upmanship
Full definition of one-upmanship
Noun
one-upmanship
(plural one-upmanships)- (idiomatic) The art or practice of successively outdoing a competitor.They are bent on one-upmanship. I think it's hopeless to try to stop them.He always engaged in one-upmanship.
- (idiomatic) A succession of instances of outdoing a competitor.