lest

IPA(Pronunciation)

/lɛst/

Conjunction

formal literary after certain expressions denoting fear or apprehension

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

Japanese Meaning

〜するのを恐れて / 〜しないように / 何かが起こるのを防ぐために / 万が一の場合に

He double-checked the locks lest someone break in.

彼は誰かが侵入するのを恐れて、鍵を念入りに二度確認した。

Sense（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.

Sense（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.