caution
How to Use Caution
Learner’s notesIn plain EnglishCarefulness to avoid risk, or a formal warning; as a verb, to warn someone.
The "formal police warning instead of charging someone" sense is distinctly British; American English doesn't use "caution" this way.
Word Forms
cautioned past tense, cautions plural, cautions singular
Fill the Gap
Can you complete this real example?
Proceed with _____ — the road is icy ahead.
Etymology
From Old French caution ("security, guarantee"), from Latin cautio, from cavere, "to be on one's guard."