First Known Use: before 12th century
Dictionary
lest
conjunction \ˈlest\
: for fear that
—used when you are saying something in order to prevent something from happening
Full Definition of LEST
: for fear that —often used after an expression denoting fear or apprehension <worried lest she should be late> <hesitant to speak out lest he be fired>
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Origin of LEST
Middle English les the, leste, from Old English thȳ lǣs the, from thȳ (instrumental of thæt that) + lǣs + the, relative particle
LEST Defined for Kids
lest
conjunction \ˈlest\
Definition of LEST for Kids
: for fear that <“I have to be sharp and clever, lest I go hungry.” — E. B. White, Charlotte's Web>
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