Meaning of SUM in English

up [phrasal verb] [M] - to express all the most important facts or characteristics about (something) in a brief wayThe purpose of a conclusion is to sum up the main points of the essay. [M]The best way of summing the situation up in our office is 'absolute chaos'. [M]The government's policy under the present leader is easy to sum up - there isn't any. [M]He's a small man with a big ego - that about sums him up, doesn't it. [M]I'd just like to sum up by saying that it's been a tremendous pleasure to work with you. [I]Some people you can sum up (= know what they are like) at a glance. [M]A judge sums up towards the end of a trial when he or she makes a speech to the jury telling them again of the main matters to consider in a case.The judge, summing up at the trial of some of the rioters, made it quite clear where the duties of the jury lay.

Cambridge English vocab.      Кембриджский английский словарь.