lest

/lɛst/

conj

For fear that; that not; in order to prevent something from happening; in case.

He studied hard lest he fail the exam.

意味（1）

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.

意味（2）

(after certain expressions denoting fear or apprehension) that (without the negative particle; introduces the reason for an emotion.)

There was danger lest the plan become known.