a curved structure that supports the weight of something above it, such as a bridge or the upper part of a building

a structure with a curved top that is supported by straight sides, sometimes forming an entrance or built as a monument

Go through the arch and follow the path.

Marble Arch is a famous London landmark.

the raised part of the foot formed by a curved section of bones

anything that forms a curved shape at the top

The branches of the trees formed an arch over the bench.

if you arch part of your body, or if it arches, it moves and forms a curved shape

to be in a curved line or shape across or over something

seeming pleased with yourself because you know more about a situation than other people

LEARNit Dictionary