tot up UK /ˌtɒt ˈʌp/US /ˌtɑt ˈʌp/ verb2 •To calculate the sum of a number of numbers or quantities.As soon as Debbie can tot up the scores, we'll know who won. •(UK) To add up (to).The bill tots up to 35 euros. formstotted up · totting up · tots up