Synonyms of ace in the hole something (as a fact or argument) that is decisive or overwhelming The security camera footage was the ace in the hole for winning the case. Synonyms for ace in the hole capper, clincher, coup de grâce (or coup de grace), crusher, topper Words Related to ace in the hole confutation, deathblow, knockout determinant,

Synonyms for ace in the hole include advantage, reserve, decisive resource, hidden advantage, secret advantage, secret weapon, sure advantage, trump card, ace up your sleeve and card up one's sleeve. Find more similar words at wordhippo.com!