<p><strong>Verb (used with object)</strong></p><ul><li>to give notice, advice, or intimation to (a person, group, etc.) of danger, impending evil, possible harm, or anything else unfavorable: They warned him of a plot against him</li><li>She was warned that her life was in danger</li><li>Synonyms: forewarn</li><li>to urge or advise to be careful; caution: to warn a careless driver</li><li>to admonish or exhort, as to action or conduct: She warned her employees to be on time</li><li>to notify, advise, or inform: to warn a person of an intended visit</li><li>to give notice to (a person, group, etc.) to go, keep at a distance, etc. (often followed by away, off, etc.): A sign warns trespassers off the grounds</li><li>A marker warned boats away from the dock</li><li>to give authoritative or formal notice to (someone); order; summon: to warn a person to appear in court</li></ul><p><strong>Verb (used without object)</strong></p><ul><li>to give a warning; caution: to warn of further disasters</li></ul>