Dreye權威釋義|lest

conj.【文】

惟恐；免得
We dare not play jokes on him lest he should become angry.
我們不敢開他玩笑生怕他動氣。
擔心
I was afraid lest the new bike should be stolen.
我擔心新自行車會被偷走。

辨析

同義:

conj.唯恐，免得

for fear that in order to avoid if perchance

以上來源於：《英漢大辭典》

conj.

formal

with the intention of preventing.
because of the possibility of.

Usage

Lest remains one of the very few contexts in English where the subjunctive mood is, strictly speaking, required. Thus the standard use is she was worrying lest he be attacked (not lest he was attacked). See also subjunctive.

Etymology

OE thȳ læs the ‘whereby less that’, later the læste.

以上來源於：《簡明牛津英語詞典》