'Learn English with Misterduncan' - All of my English Lessons - I will teach English 'Until the cows come home' What does this English phrase mean? #duncanenglish

What does the phrase 'until the cows come home' mean? Learn English phrases with Mr Duncan in England. Language captions available. #duncanenglish #englishaddictwithmrduncan #mrduncanenglish Beginner English lessons - https://www.youtube.com/playlist?list=PLbvnlSJNf_DYpgoG7UIkb0UAHegp6niLK Learn English Fast - short lessons - https://www.youtube.com/playlist list=PLbvnlSJNf_DZQy48_75zaAnH790_HJGZ3 Misterduncan's PLAYLISTS ... Full English - https://www.youtube.com/playlist?list=PLbvnlSJNf_DYX8jVA_kcIpQuRBXcf2XIZ Lessons 1 to 91- https://www.youtube.com/playlist?list=PLF467B6C12B713A03 Donate - http://www.paypal.me/misterduncan English Topic - https://www.youtube.com/playlist?list=PLbvnlSJNf_DaUGBc2dP0bSbgCtpkiCnT7 WORD STOP - https://www.youtube.com/playlist?list=PL8AC561C1AE953017 May days - https://www.youtube.com/playlist?list=PLbvnlSJNf_DaKQi3YG30D_NyX881Wsiln Dunctober - https://www.youtube.com/playlist?list=PLbvnlSJNf_DY7Olv13JrMwgdKsJ0Xwohq December drop in - https://www.youtube.com/playlistlist=PLbvnlSJNf_DY7bb_xeLDzKPEJLzN4Z3io Xmas lessons - https://www.youtube.com/playlist?list=PLbvnlSJNf_DYGEKPZ5Q1_CVxLbsH4tjVv LIVE STREAMS - https://www.youtube.com/playlist?list=PLbvnlSJNf_DbVirS_OcCiaeYxv8nUU6Ta My life in China and England - https://www.youtube.com/playlist?list=PL44BC10EEFAC0AF40 Other English lessons - https://www.youtube.com/playlist?list=PL8B3F18AC104C9F46