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|present participle||summing up|
|past tense||summed up|
|past participle||summed up|
I'll sum up briefly and then we'll take questions.
Summing up the discussion, he said that all parties would consider how best to resolve the problem.
Her reply seemed to sum up the attitude of all the refugees.
I'd already summed him up, and I knew he'd be difficult to work with.
This is the American English definition of sum. View British English definition of sum.