(historical) A series of riots in 1969 New York City, beginning with the patrons of the gay bar "The Stonewall Inn" resisting police arrest, which marked the beginning of the militant gay rights movement.

(chess) A formation in chess (a variation of the Queen's Pawn Game) in which white plays pawns to d4 and several other positions, requiring black to react energetically (see Stonewall Attack).

A proper noun "stonewall" represents several places including towns in manitoba, canada; california, usa; louisiana, usa; mississippi, usa; north carolina, usa; oklahoma, usa; texas, usa; and west virginia, usa.

Alternative letter-case form of stonewall (“alcoholic drink”)

(idiomatic) An obstruction.

(idiomatic) A refusal to cooperate.

(idiomatic, historical) An alcoholic drink popular in colonial America, consisting of apple cider (or sometimes applejack) mixed with rum (or sometimes gin or whisky).

Alternative form of stone wall (“wall made of stone”).

(transitive) To obstruct.

(transitive, intransitive, informal) To refuse to answer or cooperate, especially in supplying information.

(Britain, idiomatic) Certain, definite.