economise

verbs

spend sparingly, avoid the waste of
"This move will save money"; "The less fortunate will have to economize now"
economise, economize, save
is derived from
economiser
use cautiously and frugally
"I try to economize my spare time"; "conserve your energy for the ascent to the summit"
conserve, economise, economize, husband
is derived from
economiser