The term 'add to or subtract from' can be summarized by five different crossword solutions: AMEND (5 letters), takeaway (8 letters), DEDUCT (6 letters), TAKE (4 letters), and lathes (6 letters). AMEND means to make changes to something, usually for the better. Takeaway is a synonym for subtracting, as it means to TAKE something away. DEDUCT means to subtract an amount from a total. TAKE is another word for subtracting, as it means to TAKE something away. Lastly, lathes is a verb meaning to subtract or TAKE away a part of something.