(nautical) side by side

A relatively long, wide and thin piece of any material, usually wood or similar, often for use in construction or furniture-making.

(transitive) To step or climb onto or otherwise enter a ship, aircraft, train or other conveyance. / (transitive) To provide someone with meals and lodging, usually in exchange for money.

(basketball, informal) A rebound.

On or in a means of transportation. / (idiomatic) Joining in or participating. / (idiomatic) Agreeing or supporting. / (idiomatic) Into itself or oneself.

On a vehicle or vessel; aboard. / Agreeing or supporting; having been taken on board.

present participle of board

the act of people getting aboard a ship aircraft, train, bus etc.; embarkation / the act of a sailor or boarding party attacking an enemy ship by boarding it / a structure made of boards

plural of board

(informal, with "the") A stage (as in a theater). / Structure around a rink for ice hockey. / (publishing, informal) A hardcover binding on a book.