Rogets II: The New Thesaurus, Third Edition. 1995.
trump
NOUN:
Something, especially something held in reserve, that gives one a decisive advantage: trump card. Informal :clincher. Idioms: ace in the hole. SeeHELP, WIN.
VERB:
To outmaneuver (an opponent), especially with the aid of some extra resource: finesse. Informal :one-up. SeeWIN.