Lest
/lˈɛst/
Listen pronunciation
Definition
(conj) For fear that; that not; in order to prevent something from happening; in case.
Sentence Examples
Beware lest you should miss the train.
Take this umbrella with you lest you should get wet and catch cold.
CEFR Practice Quiz
We should leave early ____ we get stuck in the heavy evening traffic and miss the start of the concert tonight.