addverb
1join to or put with something else.
2put together (two or more numbers or amounts) to calculate their total value.
(add up) increase in amount, number, or degree.
(add up to) amount to.
3(add up)informalmake sense.
4say as a further remark.
Origin
ME: from L.addit-,addere, fromad-'to' + the base ofdare'put'.
Thesaurusaddverb
1the front porch was added in 1751: ATTACH, build on, join, append, affix, connect, annex; include, incorporate.
2they added all the figures up: TOTAL, count (up), compute, reckon up, tally;Brit.tot up.
3the subsidies added up to £1700: AMOUNT TO, come to, run to, make, total, equal, number.
4the recent riots add up to a deepening crisis: AMOUNT TO, constitute; signify, signal, mean, indicate, denote, point to, be evidence of, be symptomatic of;informalspell.
5her decision just added to his woe: INCREASE, magnify, amplify, augment, intensify, heighten, deepen; exacerbate, aggravate, compound, reinforce; add fuel to the fire, fan the flames, rub salt on the wound.
6she added that she had every confidence in Laura: GO ON TO SAY, state further, continue, carry on.
Oppositessubtract.
Phrases
add up(informal)the situation just didn't add up: MAKE SENSE, stand to reason, hold up, hold water, ring true, be convincing.