A reserve or substitute.
reinforcements
A copy of a file or record, stored separately from the original, that can be used to recover the original if it is destroyed or damaged.
An accumulation of material caused by a (partial) obstruction or (complete) blockage of the flow or movement of the material, or an accumulation of material that causes an overflow due to the flow being greater than the maximum possible flow.
Supporting, reinforcing; (music) of or related to accompaniment
Standby, reserve or extra.
That is intended as a backup.
The act of reserving or keeping back; reservation; exception.
A reserve price in an auction.
Wine held back and aged before being sold.
A body of troops kept in the rear of an army drawn up for battle, reserved to support the other lines as occasion may require; a force or body of troops kept for an exigency.
Absence of color or decoration; the state of being left plain.
A tract of land reserved, or set apart, for a particular purpose
A resist.
Restraint of freedom in words or actions; backwardness; caution in personal behavior.
A preparation used on an object being electroplated to fix the limits of the deposit.
In exhibitions, a distinction indicating that the recipient will get a prize in the event of another person being disqualified.
A member of a team who does not participate from the start of the game, but can be used to replace tired or injured team-mates.
A tract of land set apart for the use of an Aboriginal group; Indian reserve (compare US reservation.)
Funds kept on hand to meet planned or unplanned financial requirements.
A group or pile of cards dealt out at the beginning of a patience or solitaire game to be used during play.
A natural resource known to exist but not currently exploited.
To keep back; to retain.
To book in advance; to make a reservation.
To keep in store for future or special use.