if you have time, money, etc. to spare, you have more than you need; to save someone from having to go through something unpleasant; to choose not to kill, punish, or harm someone
Oxford60% of films
if you have time, money, etc. to spare, you have more than you need
Editorial20% of films
to save someone from having to go through something unpleasant
He wanted to spare me the sight of his suffering.
Editorial10% of films
to choose not to kill, punish, or harm someone
Definitions from the Oxford Advanced Learner's Dictionary, 9th edition