(transitive) To leave a problematic situation untouched; to fail to react to prevent further harm.

(slang, humorous) The condition of being stupid or crazy. / Used other than figuratively or idiomatically: see apartment, let.

(colloquial) Used around the Christmas season to express anticipation of snowfall.

present participle of let up

Third-person singular simple present indicative form of let up

(South Asia) let's learn, find out, or see [about] / (colloquial, rare) let us know, get back to us, keep us posted (often us in sense me)

Alternative form of blow off steam

(intransitive, idiomatic) To disregard or ignore a past difficulty in a relationship or an offence (when dealing with another individual).

(idiomatic) To be tolerant; to enjoy the pleasures and opportunities which life offers and to allow others to do the same.

(slang) To fart.