add up in WordNet English dictionary

1. determine the sum of
   "Add all the people in this town to those of the neighboring town"
   total  tot  tot up  sum  sum up  summate  tote up  add  add together  tally  add up 
   
2. be reasonable or logical or comprehensible
   make sense  add up 
   
3. develop into
   "This idea will never amount to anything"; "nothing came of his grandiose plans"
   come  add up  amount 
   
4. add up in number or quantity
   "The bills amounted to $2,000"; "The bill came to $2,000"
   total  number  add up  come  amount 
   

add up in English Wiktionary