(boxing) The action of practicing moves where the opponent is the boxer's own shadow.

present participle of shadow box

A device used to produce a crashing sound in a theatrical production, typically a large crate containing breakable materials. / A black box (flight data recorder). / A crash gearbox.

A building, typically adjacent to or spanning a railway line, from where signals, points and (sometimes) level crossings are controlled. / The alarm-box of a police or fire-alarm system.

(computing, graphical user interface) A user interface control for displaying an image.

(mathematical analysis) A k-cell which is a Cartesian product of half-closed intervals which are closed at their infima and open at their suprema, and such that the infimum of each interval is the coordinate of a given point (called "the corner" of the δ-box), and the length (i.e., measure) of each interval is equal to (the given value) δ.

A container into which people can put money to be collected by a charitable organization.

An opaque box with an opening, allowing a person to put their hand in, feel the object inside, and guess at what it is.

To perform a dance movement in which the two dancers step forward, join hands, then raise hands. The lady takes a step forward and does a left-face U turn back under the raised joined hands, while the man walks forward and around the lady while doing a right-face U turn back.

(computing, graphical user interface) A clickable box that maximizes a window to fill the screen or (clicked a second time) restores the window to its previous size and position.