Meaning of “sum (sth/sb) up” - Learner’s Dictionary

sum (sth/sb) up

phrasal verb with sum uk us /sʌm/ verb (present participle summing, past tense and past participle summed)

B2 to describe briefly the important facts or characteristics of something or someone:

The purpose of a conclusion is to sum up the main points of an essay.

(Definition of “sum (sth/sb) up phrasal verb, verb” from the Cambridge Learner’s Dictionary © Cambridge University Press)