Meaning

• (furniture) A piece of dining room furniture having drawers and shelves for linen and tableware; originally for serving food.

• A board or similar barrier that forms part of the side of something.

• (collectible card games) 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.

• A restriction on using the right to catch a certain number of fish that was granted in relation to a different fishery.

Meaning

• (collectible card games) To include (a card) in one's sideboard.

• To add sideboards to.