The trump coup is a contract bridge coup used when the hand on lead (typically the dummy) has no trumps remaining, while the next hand in rotation has only trumps, including a high one that would have been onside for a direct finesse if a trump could have been led.[1] The play involves forcing that hand to ruff, only to be overruffed. A similar motive is met in coup en passant, where indirect finesse is used instead of direct.
In an earlier text by George S. Coffin,[2] he names the trump coup as an "Overruff Finesse Endplay".