'add together' definitions:

Definition of 'add together'

From: WordNet
verb
Determine the sum of; "Add all the people in this town to those of the neighboring town" [syn: total, tot, tot up, sum, sum up, summate, tote up, add, add together, tally, add up]
verb
Make an addition by combining numbers; "Add 27 and 49, please!" [syn: add, add together] [ant: deduct, subtract, take off]