Synonyms of 'lest'
in caseDictionary, in order to avoid, for fear that
I was afraid to open the door lest he should follow me.
in order to avoid
for fear that
in order to prevent
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Thesaurus for lest from the Collins English Thesaurus
If you do something lest something unpleasant should happen , you do it to try to prevent the unpleasant thing from happening .