Definitions from Wiktionary (Warn)

▸ verb:  (transitive) To make (someone) aware of (something impending); especially:
▸ verb:  (transitive) To make (someone) aware of impending danger, evil, etc.
▸ verb:  (transitive) To notify or inform (someone, about something).
▸ verb:  (transitive) To summon (someone) to or inform of a formal meeting or duty.
▸ verb:  (ambitransitive, of a clock, possibly obsolete) To make a sound (e.g. clicking or whirring) indicating that it is about to strike or chime (an hour).
▸ verb:  (transitive) To caution or admonish (someone) against unwise or unacceptable behaviour.
▸ verb:  (chiefly with "off", "away", and similar words) To advise or order to go or stay away.
▸ verb:  (intransitive) To give warning.
▸ noun:  A surname.

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