lest

word

/ˈɫɛst/
/lˈɛst/

Definition

Used in formal or literary English to show you are doing something to prevent something bad from happening; it means 'for fear that' or 'in case.'

Usage & Nuances

Very formal and mostly used in written, literary, or old-fashioned English. Followed by a verb in the subjunctive (bare form): 'lest he forget.' Not common in everyday conversation; use 'in case' or 'so that' in spoken English.

Example Sentences

Keep the door shut, lest the dog run out.

natural

Take your umbrella, lest it rain.

basic

He spoke quietly, lest anyone hear.

basic

I remind myself, lest I forget.

basic

She whispered the answer, lest the teacher notice.

natural

She set an early alarm, lest she oversleep again.

natural