The meaning of LEST is for fear that —often used after an expression denoting fear or apprehension. How to use lest in a sentence. for fear that —often used after an expression denoting fear or apprehension… See the full definition. Games; Word of the Day; Grammar; Wordplay; New Slang; Rhymes; Word Finder; Thesaurus; Join MWU ...

LEST definition: 1. in order to prevent any possibility that something will happen: 2. in order to prevent any…. Learn more.