Antonyms of verb overspend

2 senses of overspend

Sense 1
overspend -- (spend more than available of (a budget))
       Antonym of underspend (Sense 1)
      => underspend -- (spend less than the whole of (a budget, for example))

Sense 2
overspend -- (spend at a high rate)
       Antonym of underspend (Sense 2)
      => underspend -- (spend at less than the normal rate)

Synonyms/Hypernyms (Ordered by Estimated Frequency) of verb overspend

2 senses of overspend

Sense 1
overspend -- (spend more than available of (a budget))
       => spend -- (spend completely; "I spend my pocket money in two days")

Sense 2
overspend -- (spend at a high rate)
       => consume, squander, waste, ware -- (spend extravagantly; "waste not, want not")