Antonyms of verb subtract

1 of 2 senses of subtract

Sense 1
subtract, deduct, take off -- (make a subtraction; "subtract this amount from my paycheck")
       Antonym of add (Sense 4)
      => add, add together -- (make an addition by combining numbers; "Add 27 and 49, please!")

Synonyms/Hypernyms (Ordered by Estimated Frequency) of verb subtract

2 senses of subtract

Sense 1
subtract, deduct, take off -- (make a subtraction; "subtract this amount from my paycheck")
       => calculate, cipher, cypher, compute, work out, reckon, figure -- (make a mathematical calculation or computation)

Sense 2
subtract -- (take off or away; "this prefix was subtracted when the word was borrowed from French")
       => reduce, cut down, cut back, trim, trim down, trim back, cut, bring down -- (cut down on; make a reduction in; "reduce your daily fat intake"; "The employer wants to cut back health benefits")