spare
US /sper/
UK /sper/

1.
additional to what is required for ordinary use
:
•
Do you have a spare key?
•
We have a spare room for guests.
1.
2.
refrain from harming or destroying; leave unharmed
:
•
The king decided to spare the prisoner's life.
•
Please spare me the details.
1.
a spare part, especially a spare wheel or tire
:
•
Make sure you have a spare in your car.
•
The mechanic replaced the broken part with a spare.