[lest] conj [ME les the, leste, fr. OE thy laes the, fr. thy (instrumental of thaet that) + laes + the, relative particle] (bef. 12c): for fear that--used after an expression denoting fear or apprehension "worried ~ she should be late" "hesitant to speak out ~ he be fired"
LEST
Meaning of LEST in English
Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012