arch

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.

To form into an arch shape.

The cat arched its back.

GBR will either be letting operating contracts or running rail companies directly, depending on which party wins the next General Election. Whichever it is, you can be forgiven for arching an eyebrow at an infrastructure company being placed in overall control.

To cover with an arch or arches.

Knowing, clever, mischievous.

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

[He] spoke his request with so arch a leer.

Cute, sly, prematurely wise.

Principal; primary.

They were arch enemies.

the most arch act of piteous massacre