triple check noun 1verb 1forms 3 noun1 •A third check, a verification made a third time, usually with additional caution or attention.Did you make a double check and a triple check of the entire minefield before proceeding? verb1 •To check a third time; to check thrice, with extra caution or attention; to reverify or make sure yet again.Did you double check and triple check of the entire minefield before proceeding? formstriple checked · triple checking · triple checks