
Lest
Cautionary Use
Use 'lest' when advising caution to avoid negative outcomes.

Speak softly lest you wake the baby.
Triggering Action
'Lest' often precedes actions taken to prevent an unwanted scenario.

Save your work regularly, lest the computer crashes.
Emotional Intensity
Using 'lest' can add a sense of urgency or importance to the caution.

Stay silent, lest we are discovered.
Compare with
Unless
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