lest

[lest]

conjunction

1. for fear that; so that (one) should not (used negatively to introduce a clause expressive of an action or occurrence requiring caution).

   He kept his notes by his side lest faulty memory lead him astray.

2. that (used after words expressing fear, danger, etc.).

   There was danger lest the plan become known.

lest

/ lɛst /

conjunction

1. so as to prevent any possibility that

   he fled the country lest he be captured and imprisoned

2. (after verbs or phrases expressing fear, worry, anxiety, etc) for fear that; in case

   he was alarmed lest she should find out

Word History and Origins

Origin of lest¹

First recorded before 1000; Middle English leste, contraction of the lesse the, thi les the; late Old English the lǣste, earlier thȳ lǣs the, literally, “whereby less that” ( thȳ instrumental case of the demonstrative and relative pronoun, lǣs less, the conjunction)

Word History and Origins

Origin of lest¹

Old English the lǣste, earlier thӯ lǣs the, literally: whereby less that

Idioms and Phrases

Idioms

1. lest we forget. lest we forget.

Example Sentences

Once again, what Republicans are proposing is so odious that Democrats cannot be seen to have voted for it, lest their own voters turn on them.

From Salon

A musician being filmed for a documentary wouldn’t want to alienate the fans that have been an integral part of their success, lest they risk damaging their brand.

From Salon

He even declined to state his personal views on the Democratic gerrymander, lest someone mistakenly assume Fornaciari was speaking on the commission’s behalf.

From Los Angeles Times

Predictions that AI would yield a burst of increased worker productivity haven’t been fulfilled; in many fields, productivity declines, in part because workers have to be deployed to double-check AI outputs, lest their mistakes or fabrications find their way into mission-critical applications — legal briefs incorporating nonexistent precedents, medical prescriptions with life-threatening ramifications and so on.

From Los Angeles Times

While some music festivals have been canceled or postponed for fear of migra raids, others have gone on as planned lest ICE win.

From Los Angeles Times