lest

/lɛst/

conjunction

For fear that; that not; in order to prevent something from happening; in case.
"He won’t go outside, lest he be eaten by those ravenous eagles."
Similar: before
(after certain expressions denoting fear or apprehension) that (without the negative particle; introduces the reason for an emotion.)
"I am afraid lest I revealed too much."

Practice "lest" in context

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