Longman Dictionary of Contemporary English homepage

Language: Old English
Origin: thy læs the 'by which less that'

lest

 conjunction
     
lest literary
1 in order to make sure that something will not happen:
She turned away from the window lest anyone see them.
2 used to show that someone is afraid or worried that a particular thing might happen
worried/concerned/anxious etc lest ...
He paused, afraid lest he say too much.
She worried lest he should tell someone what had happened.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
 
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