(slang) An intercom or public address system.

A post office box.

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.

(idiomatic, intransitive) To act wisely.

box jellyfish

(South Africa, slang) A payphone.

(informal) A blank square on a form in which a check mark or cross may be placed in order to indicate a selection.