lest
/lest; lɛst/ conj
(fml 文)
1 for fear that; in order that...not 唯恐; 以免; 为不使
He ran away lest he (should/might) be seen. 他怕人家看见他而跑开了.
Lest anyone should think it strange, let me assure you that it is quite true. 我向你们保证那是真事, 以免有人觉得奇怪.
2 (used after fear, be afraid, be anxious, etc 用於fear、 be afraid、 be anxious等之後)
She was afraid lest he might drown. 她担心他会淹死.