Definitions
1.NounA piece of dining room furniture having drawers and shelves for linen and tableware; originally for serving food.
2.NounA board or similar barrier that forms part of the side of something.
3.NounA 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.NounA restriction on using the right to catch a certain number of fish that was granted in relation to a different fishery.
5.VerbTo include (a card) in one's sideboard.
6.VerbTo add sideboards to.