WordReference English-Spanish Dictionary © 2014:

Principal Translations
sumar vtr (obtener el resultado de una adición)make vtr
 equal, be equal to v expr
 sumadd up to, come to vi + prep
 3 más 5 suman 8.
 3 and 5 make 8.
sumar vtr (añadir, agregar, incorporar)add vtr
 La dirección corporativa sumó a un experto en mercadotecnia a su equipo.
 The company directors added a marketing expert t their team.
sumarse vpron (adherirse, incorporarse)join in vi + prep
 Mi hermano desea sumarse al proyecto.
 My brother wants to join in the project.
  Is something important missing? Report an error or suggest an improvement.

WordReference English-Spanish Dictionary © 2014:

Compound Forms:
sumar esfuerzos join efforts
sumar tiempo count time
  Is something important missing? Report an error or suggest an improvement.

'sumar' found in these entries
In the Spanish description:
English:

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