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The Collaborative International Dictionary
Underspend

Underspend \Un`der*spend"\, v. t. To spend less than.

Wiktionary
underspend

n. An amount by which an allocated amount is not expended. vb. To not spend funds appropriated or allocated.

WordNet
underspend
  1. v. spend less than the whole of (a budget, for example) [ant: overspend]

  2. spend at less than the normal rate [ant: overspend]