underspendverb [ I or T ]uk /ˌʌndəˈspend/ us underspent FINANCE, ECONOMICS
Departments that are underspending are being allowed to carry unused parts of their budgets forward.
underspendnoun [ C or U ]uk /ˈʌndəspend/ us underspent FINANCE, ECONOMICS
The Scottish Executive had a year-end underspend of £750m.
an underspend on sth The underspend on the capital investment programme might be due to cutting corners.