What is the meaning of Stonewall?

An obstruction.

A refusal to cooperate.

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).

To obstruct.

To refuse to answer or cooperate, especially in supplying information.

Certain, definite.

Source: wiktionary.org