ˌdouble ˈquick BrE AmE adverb British English informal
as quickly as possible:
Call an ambulance double quick!
—double-quick adjective [only before noun] :
Lunch was produced in double-quick time.
ˌdouble ˈquick BrE AmE adverb British English informal
as quickly as possible:
Call an ambulance double quick!
—double-quick adjective [only before noun] :
Lunch was produced in double-quick time.
Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012