noun. The act of one who sums, in any sense of the verb sum; specifically, the act or process of working out an arithmetical problem.

noun. In law: The address of the judge to the jury on a trial, after the close of the evidence and generally after arguments of counsel, usually recapitulating the essential points of the case and the evidence, and instructing them on the law. This is the English usage of the phrase, and corresponds to the charge or the American use of the word instructions.

noun. The argument of counsel at the close of evidence on a trial either before a jury or before a judge or referee. This is the American usage of the phrase.

verb. Present participle of sum.

"Such was the horror of the conflict it became known, in a phrase summing up the vanity of hope, as "the war to end all wars.""

summing up  

becoming  coming  cumming  drumming  dumbing  

sum