To move people closer together. / To shut a building or a business for a period of time. / To heal a cut or other wound / To become less 'open' or communicative, to shrink back.

Very near proximity.

In a confined space.

plural of close quarter

(historical) A helmet that entirely covers the head, including the face.

Cut very short. / Having the hair cut very short.

A business or industrial establishment whose employees are required to be labor union members as a precondition to employment.

(of a video recording or broadcast) Having captions that can only be seen with the appropriate equipment.

set close together

A circuit through which electrons can flow. / A complete electric circuit around which current can flow.