arch1

noun

• a curved symmetrical structure spanning an opening and typically supporting the weight of a bridge, roof, or wall above it.
• an arched structure forming a passageway or a ceremonial monument:a triumphal arch
• a shape resembling an arch or a thing with such a shape:the delicate arch of his eyebrows
• the inner side of the foot.

verb

• 1 [no object] have the curved shape of an arch:a beautiful bridge that arched over a canal
• form or cause to form the curved shape of an arch:her eyebrows arched in surprise [with object]:she arched her back

• 2 [with object] (usually as adjective arched) provide (a bridge, building, or part of a building) with an arch:high arched windows
• archaic or literary span (something) by or as if by an arch:the vine arched his evening seat