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.

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