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warn
WIKTIONARY
warn
Verb
  • To make (someone) aware of impending danger etc. [from 11th c.] transitive
  • To caution (someone) against unwise or unacceptable behaviour. [from 11th c.] transitive
  • To notify (someone) of something untoward. [from 13th c.] transitive
  • To give warning. intransitive
Verb
  • To refuse, deny (someone something). obsolete