Wrestler who deliberately loses to make his opponent look good

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
c.2000, professional wrestling slang for one whose main purpose is to make the better-known wrestlers of the organization look good; he or she does this by losing to them. More commonly known as a jobber (though some enthusiasts claim there is a difference), ...

Wiktionary Word definitions in Wiktionary
n. (context professional wrestling slang English) a performer whose primary role is to lose to established talent.