lest[lest]

• conj.
  • 以免，免得；惟恐：

    He got up early that morning lest he should miss the train.

    他那天早上起得很早，生怕误了火车。

  • [用在表示“担心、恐惧、危险”等的词后，引出从句]：

    The parents were afraid lest he should fail in the final examination.

    父母担心他期末考试不及格。