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Verb: upsize  'úp,sIz
  1. Increase the size, scale, or quantity of something
    "The company decided to upsize their office space"
     
  2. [informal] (in fast food) increase the size of a meal or portion for an additional cost
    "Would you like to upsize your fries and drink?"
Noun: upsize  'úp,sIz
  1. An increase in size, scale, or quantity, especially in a business or fast food context
    "The upsize of the project budget was approved"

Derived forms: upsized, upsizes, upsizing