take advantage of someone—outwit a person, especially unfairly; make undue use of an advantage:
- “You have brought me here under false pretences,” I cried. “You have taken cowardly advantage of me.”
Note: The expression does not correlate in meaning with the phrase have the advantage of someone—(also: have an advantage over someone) have a better position or opportunity than another person:
- “You have the advantage of me in courtesy as well as in years, sir,” I replied.
take someone at advantage—(dated) take a person by surprise:
- The enemy effected a passage across the sierra, where a much inferior force to his own might have taken him at advantage.