Webster's English Dictionary

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lest

lest \(.)lest\ cj [ME les the, leste, fr. OE thy- l-s the, fr. (Xthy- 
   (instrumental of tht that) + l-s + the, relative particle 1: for 
   fear that  2: THAT - used after an expression denoting fear or apprehension 
   <(worried ~ he should be late}