n.
 a religious song or popular hymn associated with Christmas.
v.
 (carols, carolling, carolled; US carols, caroling, caroled)
  - 
(go carolling)
 sing carols in the streets.
 - sing or say (something) happily.
 
 
  Derivative
  
    - caroller 
(US caroler)
 n.
  - carolling 
(US caroling)
 n.
 
   
  Etymology
  ME: from OFr. carole (n.), caroler (v.), of unknown origin.