lest
1
used to indicate a precaution or attempt to avoid a particular undesirable outcome
- She covered the plants with plastic, lest they freeze in the cold weather.
- He left a note on the door, lest anyone think the house was empty.
- She spoke softly, lest she wake the sleeping baby.
- He double-checked the address before leaving, lest he get lost on the way.
- They hurried home, lest they miss the last train.
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