reserve
re-serve
noun
A stock of something kept available for use when needed; a backup.
"The nation's oil reserves are dwindling rapidly."
noun
A lack of warmth or openness in manner; a quiet, formal disposition.
"Her natural reserve made her seem quite shy."
verb
To book or set aside something for a particular person or future use.
"We need to reserve a table for dinner tonight."
Thesaurus
Synonyms: modesty, book, hold, second-stringer, substitute, military reserve, taciturnity, reticence, backlog, stockpile, set aside, appropriate