Definitions

1. verb

past tense of warn, to give a warning or caution to someone about something

“The doctor warned her about the dangers of smoking.”

2. verb (archaic)

past tense of warn, to give a signal or indication of something, especially in nautical contexts

“The lookout warned the captain of the approaching storm.”

3. past participle

past participle of warn, having given a warning or caution

“The warned crew was unable to navigate the treacherous waters.”