"economize" in the verb sense
1. conserve, husband, economize, economise
use cautiously and frugally
"I try to economize my spare time"
"conserve your energy for the ascent to the summit"
2. save, economize, economise
spend sparingly, avoid the waste of
"This move will save money"
"The less fortunate will have to economize now"
Source: WordNet® (An amazing lexical database of English)
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