Definition of "Spare" :
noun: a score in tenpins; knocking down all ten after rolling two balls
noun: an extra car wheel and tire for a four-wheel vehicle
noun: an extra component of a machine or other apparatus
verb: use frugally or carefully
verb: give up what is not strictly needed
"He asked if they could spare one of their horses to speed his journey."
verb: refrain from harming
verb: save or relieve from an experience or action
"I'll spare you from having to apologize formally."
adjective: lacking embellishment or ornamentation
adjective: lacking in magnitude or quantity
"A spare diet."
adjective: thin and fit
"The spare figure of a marathon runner."
adjective: more than is needed, desired, or required
"Sleeping in the spare room."
adjective: kept in reserve especially for emergency use
"A spare tire."
adjective: not taken up by scheduled activities
"Spare time on my hands."