clincher Synonyms

decisive factor determiner determining factor forceful argument eloquent argument determiners conclusive proof availing argument convincing argument compelling argument argument of great weight persuasive argument good argument potent argument deciding factor final stroke final blow valid reason deciding moment crowning blow finishing stroke satisfactory argument reasonable evidence powerful argument mercy stroke trump card riveting machine determinant decider deathblow culmination cogent cogency clench clasper clamp determinative end-all finisher kiss of death coup de grace trump sockdolager settler riveter quietus gripper grabber capper