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To give a brief and accurate summary, description, assessment, or representation of something; to summarize. A noun or pronoun can be used between "sum" and "up." To sum up, we need to reduce our expenditures and target new markets in order to grow. I feel like the book sums up everything I've been feeling since we moved. I can sum the project up in just three words: "Waste of time."
sum (something) up
to give a summary of something. I would like to sum this lecture up by listing the main points I have covered. It is time for me to sum up. She summed up the president's speech in three sentences.
Present the substance of, summarize, as in They always sum up the important news in a couple of minutes, or That expletive sums up my feelings about the matter. [Early 1600s]
1. To present the substance of something in a condensed form; summarize something: At the end of the radio program, they sum up the day's news. Here's what I learned—I'll sum it up for you. At the end of the lecture, the professor summed up.
2. To describe or assess something concisely: This poem sums up my feelings perfectly.
3. To add some set of numbers together: The teacher challenged the students to sum up the numbers from 1 to 100 as fast as possible. I wrote down all of our expenses for the week and summed them up.
4. To calculate something, especially by addition: We need to sum up our total costs for this trip. I'm sure this answer is correct—I summed it up myself.