lest

conj

• ① 以免…,因恐…
  • Hide it lest they (should) see it.把它藏起来,以免让他们看到(★【口】多半不用should)。

• ②[与fear, be afraid, be frightened等连用]担心…发生
  • She was afraid lest he (should) be angry.她担心他会生气(★【口】多半不用should)。