An inverted U shape.

An arch-shaped arrangement of trapezoidal stones, designed to redistribute downward force outward.

An architectural element having the shape of an arch

Any place covered by an arch; an archway.

"to pass into the arch of a bridge"

An arc; a part of a curve.

A natural arch-shaped opening in a rock mass.

Curved part of the bottom of a foot.

To form into an arch shape

"The cat arched its back"

To cover with an arch or arches.

A chief.

Knowing, clever, mischievous.

"I attempted to hide my emotions, but an arch remark escaped my lips."

Principal; primary.

"They were arch enemies."