arc arc /ˈɑːrk/

noun

1. () Electrical conduction through a gas in an applied electric field  ( electric arc , discharge , electric discharge , arc , spark )
   electrical conduction through a gas in an applied electric field
     The lightning created a brilliant arc across the stormy sky.
   The lightning created a brilliant arc across the stormy sky.
   
   
2. () A continuous portion of a circle  ( arc )
   a continuous portion of a circle
    The arc of the rainbow spanned the entire sky
   The arc of the rainbow spanned the entire sky
   
   
3. Something curved in shape  ( arc , bow )
   something curved in shape
   
   

verb

1. Form an arch or curve  ( arc , curve , arch )
   form an arch or curve
    Her back arches
   her back arches
    Her hips curve nicely
   her hips curve nicely