Longman Dictionary of Contemporary English homepage

Language: Old English
Origin: spær

spare

1 adjective
     
spare1 S2
1

extra

spare key/battery/clothes etc

a key etc that you keep in addition to the one you usually use, so that it is available if the one you usually use breaks, gets lost etc:
a spare key
Bring a towel and some spare clothes.
a supply of spare batteries
a spare tyre
2

not used/needed

[usually before noun] not being used or not needed at the present time:
Have you got any spare boxes?
You could sleep in the spare bedroom.
Do you have any spare cash.
I'll go and see if there are any spare seats.
A decline in beer sales had left the industry with spare capacity (=the ability to produce more than can be sold).
3

time

spare time/moment/hour etc

time when you are not working:
What do you do in your spare time?
Eric spent every spare moment he had in the library.
4

money

spare change

coins of little value that you do not need and can give to other people:
There are beggars on every corner asking for spare change.
5

be going spare

British English spoken if something is going spare, it is available for you to have or use:
I'll have some of that cake if it's going spare.
6

go spare

British English informal to become very angry or worried:
Dad would go spare if he found out.
7

plain

a spare style of writing, painting etc is plain or basic and uses nothing unnecessary
8

thin

literaryAL someone who is spare is tall and thin

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