Conjunction

(English Conjunctions)

For fear that; that . . . not; in order that . . . not; in case.

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* {{quote-magazine, date=2013-07-27, volume=408, issue=8846, magazine=(The Economist)

, title= Lunacy? , passage=Lest any astrologer reading this result get cocky, Dr Cajochen does not believe that what he has found is directly influenced by the Moon through, say, some tidal effect. What he thinks he has discovered is an additional hand on the body’s clock-face.}}

That (without the negative particle); – after certain expressions denoting fear or apprehension.

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, title=(The Celebrity), chapter=4 , passage=Mr. Cooke at once began a tirade against the residents of Asquith for permitting a sandy and generally disgraceful condition of the roads. So roundly did he vituperate the inn management in particular, and with such a loud flow of words, that I trembled lest he should be heard on the veranda.}}