What does the word sum mean?

Usage examples for sum

  1. I sum up my feelings when I say that it is an action I do not think you will ever regret. – The Red Rat's Daughter by Guy Boothby
  2. That seemed to sum it up. – O+F by John Moncure Wetterau
  3. That is your answer, that is the sum of your churchman's argument! – The White Sister by F. Marion Crawford