Meaning of the word lest in English

What does lest mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

lest

US /lest/
UK /lest/

Conjunction

with the intention of preventing (something undesirable); to avoid the risk of

Example:
She worried about speaking up, lest she offend someone.
He ran quickly, lest he miss the bus.