What is the meaning of add up?

verb

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