1 total, aggregate, grand total, sum total, whole, totality; amount, quantity:
The sum of money found in the satchel was not revealed by the police. He would give the neighbourhood children small sums to spend on sweets.
2 sum up.
(a) recapitulate, summarize, encapsulate, synopsize, digest, abridge, condense, consolidate, epitomize, review:
He summed up by reminding the children not to accept gifts from strangers.
(b) reckon, add up, calculate, total, tot up, measure (up), take the measure of:
They summed up their chances of escaping.
(c) estimate, evaluate, size up, assess:
She had summed him up the minute she saw him.