A popular music production technique, developed in the 1960s, in which a number of musicians perform the same instruments or parts in unison and the resulting sound is re-recorded in an echo chamber.

Disaster is imminent.

plural of wall plug

(UK) A fixing that allows screws to be fitted into masonry walls, a dowel or screw anchor. / (US) An electric socket.

A fortification of stone and turf built by the Roman Empire across what is now the Central Belt of Scotland.

A fortification of stone and timber built by the Roman Empire across the width of what is now northern England.

A motordrome. / A form of moshing in which audience members divide into two halves and run toward each other.

plural of wall kick

(video games) A sideways movement that results from a rotation of a piece that is touching the left or right walls in certain versions of the video game Tetris. / (video games) A wall jump.

A hypothetical 2-dimensional analog of a cosmic string.