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Definition of lest:

  1. For fear that; that . . . not; in order that . . . not.
  2. Last; least.
  3. Lust; desire; pleasure.
  4. That ( without the negative particle); - after certain expressions denoting fear or apprehension.
  5. To listen.


coordinating conjunction, correlative, 'cause, although, causal, albeit, conjunction, assuming, and, or, and/or, so that, to prevent, in order to avoid.

Usage examples: