talk to a brick wall

all talk and no cider

All talk and no results.

back to the wall

A very difficult situation with no beneficial options available for action.

balls to the wall

With maximum effort or commitment.

bang one's head against a brick wall

To waste effort on a futile project.

big talk

Statements which are boastful or exaggerated.

blue wall of silence

Strict secretiveness maintained by the members of a police force with respect to information which might be contrary to their interests, especially information concerning questionable police actions.

break the fourth wall

To apparently communicate with reality directly, such as when characters of literature comment on the existence of a reader.

brick in

To enclose with bricks.