The art or practice of successively outdoing a competitor. / A succession of instances of outdoing a competitor.

(idiomatic) To outdo, to perform something slightly better than a competitor's prior effort.

(especially in phrases like get one up on someone) An advantage over someone. / (video games) Alternative spelling of 1-up (“extra life”)

(idiomatic) To misspeak, to say something embarrassing or wrong, or to make a mistake in public, or a social blunder, that is embarrassing or offensive.

(idiomatic) born rich, or into a wealthy family

(rugby) A foul in which a player knocks the ball forward. / (chiefly UK) Resulting as an indirect effect.

(idiomatic) To feel energetic or frisky; to behave in a vigorous or bold manner. / (idiomatic) To feel important; to be empowered.

(idiomatic) To begin gaining experience; to tentatively try something new.

(intransitive, idiomatic) To get confused or mixed up about another person's intentions; to misunderstand one another.

(idiomatic, chiefly in the negative) To identify, specify, name or pick out.