Underspend

verb (used with object), spent, spending.
1.
to pay out, disburse, or expend; dispose of (money, wealth, resources, etc.):
resisting the temptation to spend one’s money.
2.
to employ (labor, thought, words, time, etc.), as on some object or in some proceeding:
Don’t spend much time on it.
3.
to pass (time) in a particular manner, place, etc.:
We spent a few days in Baltimore.
4.
to use up, consume, or exhaust:
The storm had spent its fury.
5.
to give (one’s blood, life, etc.) for some cause.
verb (used without object), spent, spending.
6.
to spend money, energy, time, etc.
7.
Obsolete. to be consumed or exhausted.
verb -spends, -spending, -spent
1.
to spend less than (one can afford or is allocated)
noun (ˈʌndəˌspɛnd)
2.
the amount by which someone or something is underspent
verb spends, spending, spent
1.
to pay out (money, wealth, etc)
2.
(transitive) to concentrate (time, effort, thought, etc) upon an object, activity, etc
3.
(transitive) to pass (time) in a specific way, activity, place, etc
4.
(transitive) to use up completely: the hurricane spent its force
5.
(transitive) to give up (one’s blood, life, etc) in a cause
6.
(intransitive) (obsolete) to be used up or exhausted
7.
(Brit, informal) spend a penny, to urinate
noun
8.
an amount of money spent, esp regularly, or allocated to be spent
see: pocket (spending) money