on draught

on draft

Drawn or served from a large container, especially a keg, as opposed to individual bottles or containers. (Spelled "on draught" in British English.) We have a wide range of craft beers on draft, including some from our own in-house microbrewery.
See also: draft, on
Farlex Dictionary of Idioms.

on ˈdraught

(British English) (of beer) taken from a barrel (= a large container): This beer is not available on draught (= it is available only in bottles or cans).
See also: draught, on
Farlex Partner Idioms Dictionary
See also:
  • on draft
  • on offer
  • on sale
  • keg
  • keg party
  • on tap
  • growler
  • kegger
  • keggers
  • hammer some beers