/ Dictionary / Index L letup: Meaning and Definition of Find definitions for: let•up Pronunciation: (let'up"), [key] — n. Informal. cessation; pause; relief. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: letup (Thesaurus) lettuce Letzeburgesch Related Content Daily Word Quiz: arboreal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language