sideboard

Short definition from Wiktionary

Noun

1. 1
   A piece of dining room furniture having drawers and shelves for linen and tableware; originally for serving food.
2. 2
   A board or similar barrier that forms part of the side of something.
3. 3
   A set of cards that are separate from a player's primary deck, used to customize a match strategy against an opponent by enabling a player to change the composition of the playing deck.
4. 4
   A restriction on using the right to catch a certain number of fish that was granted in relation to a different fishery.

Verb

1. 1
   To include (a card) in one's sideboard.
2. 2
   To add sideboards to.