Excessive commenting on the actions and decisions of someone playing a video game, by an individual who is not playing the game.

(automotive) The action of excessively commenting on the actions and decisions of someone operating a motor vehicle, by an individual who is not operating the vehicle, in an attempt to control the vehicle.

present participle of back-seat drive

(transitive, figuratively) to cause problems for one at a later time.

plural of back-door pilot

(film, television) A film, miniseries, or episode that serves as a proof of concept for a new full television series, but may be broadcast on its own even if the full series does not come to fruition.

A typically men's haircut where the sides and the back are left shorter than the top of the hair.

A condition characterized by chronic pain after back surgery.

(idiomatic) To be prepared and willing to support or defend someone.

(bodybuilding) A standard pose in which both sets of biceps and back muscles are flexed, with one's back turned toward the judges.