匾 meaning in English — backing, slab

English meaning

backing noun Support, especially financial support, given to a person or project.
slab noun A thick, flat piece of a hard material, such as stone or concrete.

匾 is used for these senses in English:

backing A liner or other material added behind or underneath.
circuit board (electronics, computer hardware) A board on which electronic components and their interconnecting circuits are mounted or etched.
license plate An identifying tag, usually made of metal, bearing a sequence of letters or numbers identifying the vehicle, and placed at the rear and, often, also at the front of a motor vehicle.
slab A paving stone; a flagstone.
tectonic plate (geology) Any of several large pieces of the Earth's lithosphere which participate in plate tectonics.