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.

(transitive, intransitive) To stop trading as a business. / (transitive) To surround someone, as to impede their movement.

(embryology) A molecular oscillator, governed by periodic shifts in gene expression, which influences the timing of vertebrate somitogenesis.

An actor who stands upstage, forcing the other actors to face him and turn their backs to the audience, in order to draw more attention to himself.

(meteorology) polar stratospheric cloud

(meteorology) A relatively rare type of clouds that occurs high in the stratosphere; polar stratospheric clouds often resemble mother-of-pearl as they shine in vivid colours, known as irisation

In a confined space.

plural of close quarter

Very near proximity.

(uncountable) A flexible wire-mesh material, consisting of loosely woven wires in a simple rectangular grid.