1arch 
/ˈɑɚtʃ/ noun
plural arch·es /ˈɑɚtʃ/ noun [count] 1 : a usually curved part of a structure that is over an opening and that supports a wall or other weight above the opening 2 : the raised area on the bottom of the foot that is formed by a curved section of bones — see picture at foot 3 : something that has a curved shape
▪ There was a slight arch to her eyebrows. ▪ an arch in the cat's back
▪ There was a slight arch to her eyebrows. ▪ an arch in the cat's back
