fourth gear

all the gear and no idea

Having high-quality, expensive equipment for a risky or difficult activity, without any of the requisite knowledge.

break the fourth wall

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

click into gear

To start to perform effectively or to progress

find another gear

To suddenly achieve an extra burst of athletic performance, especially after a sustained period of competitive exertion.

fourth estate

Journalism or journalists considered as a group; the press.

fourth wall

The imaginary invisible wall at the front of the stage in a proscenium theatre, through which the audience sees the action in the world of the play.

gear up

To prepare for an activity.

get one's ass in gear

To exert effective effort; to get going; to get moving; to start producing.