arch enemy
 

* 1.greatest foe

2.leading adversary

English Related Words* abutment arch

* alien enemy

* alveolar arch

* antitwilight arch

* aortic arch

* arch

* arch brick

* arch bridge

* arch buttress

* arch dam

* arch fiend

* arch nudnik

* arch of the instep

* arch one's back

* arch one's eyebrows