Meaning of lest
Pronunciation: (lest), [key]
- for fear that; so that (one) should not (used negatively to introduce a clause expressive of an action or occurrence requiring caution): He kept his notes by his side lest faulty memory lead him astray.
- that (used after words expressing fear, danger, etc.): There was danger lest the plan become known.
- lest (Thesaurus)