An extra check or 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? To check again; to check with extra caution or attention; to verify or make sure.

What does triple check mean?

to triple check: to make extremely sure, to verify for a third time. idiom.

What comes after triple check?

English translation: 2 = double, 3 = triple, 4 = quadruple, 5 = quintuple, 6 = sextuple, 7 = septuple, 8 = octuple.