Lest

usgb/lest/
conjunction

Used to introduce a possibility of something bad happening, and to say someone must do or not do something to prevent it.

He is always careful when he drives, lest he has an accident.
Visual representation of "lest" - Used to introduce a possibility of something bad happening, and to say someone must do or not do something to prevent it.

Often appears as...

  • lest we forget
  • lest he forgets

Usage tips

Formal

Definition 1 of 2
Visual representation of "lest"
LampPro Tip 1/3

Cautionary Use

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

Illustration for Cautionary Use
Speak softly lest you wake the baby.
LampPro Tip 2/3

Triggering Action

'Lest' often precedes actions taken to prevent an unwanted scenario.

Illustration for Triggering Action
Save your work regularly, lest the computer crashes.
LampPro Tip 3/3

Emotional Intensity

Using 'lest' can add a sense of urgency or importance to the caution.

Illustration for Emotional Intensity
Stay silent, lest we are discovered.
Visual representation of the word "Lest"

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