A relief valve set to open at a pressure below that at which a container (such as a boiler) would burst. / (figuratively) Any mechanism offering relief from pressure or tension, e.g. emotionally.

(printing, historical) The handle of a printer's ball.

Third-person singular simple present indicative form of berth

An inner city area of Glasgow, Scotland, on the north bank of the River Clyde (OS grid ref NS5566).