Synonyms of 'in reserve'
▷ See reserve
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It took her a long time to get ready for church.
You use spare to describe something that is the same as things that you are already using, but that you do not need yet and are keeping ready in case another one is needed.
He could have taken a spare key.
Thesaurus for in reserve from the Collins English Thesaurus
If you have something in reserve , you have it available for use when it is needed .