"Emphatic defeat" means a clear and strong loss or failure, where the outcome leaves no doubt about the superiority or dominance of the opposing side. Full definition
By then the Hammers were in complete disarray and it could well have been a more emphatic defeat. (westhamway.net)
Labour's emphatic defeat at the 2015 General Election served as a warning - call; the New Labour vision which had swept it to office in 1997 was no longer relevant with a changed and jaded public. (bluelabour.org)
Sure, there have been outriders floating radical ideas about policy and party reform, yet despite the fears among MPs that there would be a period of blood - letting following Owen Smith's emphatic defeat in the second leadership election last summer, there has been no abuse of the party's internal processes by Corbyn, evidenced by the failure of his supporters to secure berths in the pre-election carve - up of safe seats. (labour-uncut.co.uk)