To brick a device is to make it unusable, essentially turning it into the functional equivalent of an actual brick.
Strictly speaking a bricked device is broken in hardware in some way and cannot be recovered by normal means. Bricked phones, for example, normally need to be replaced or returned to the manufacturer for repair.
The term brick is also used more loosely to refer to software issues rendering a device unusable or unbootable. A bricked PC usually requires booting re-installation or recovery media in order to restore a backup image, or reinstall an operating system from scratch.
A brick is a type of block used to build walls, pavements and other elements in masonry construction. Properly, the term brick denotes a block composed of dried clay, but is now also used informally to denote other chemically cured construction blocks. Bricks can be joined together using mortar, adhesives or by interlocking them. Bricks are produced in numerous classes, types, materials, and sizes which vary with region and time period, and are produced in bulk quantities.
Block is a similar term referring to a rectangular building unit composed of similar materials, but is usually larger than a brick. Lightweight bricks (also called lightweight blocks) are made from expanded clay aggregate.
Fired bricks are one of the longest-lasting and strongest building materials, sometimes referred to as artificial stone, and have been used since circa 4000 BC. Air-dried bricks, also known as mudbricks, have a history older than fired bricks, and have an additional ingredient of a mechanical binder such as straw.