sellout

1. (informal, idiomatic) An action in which principles are compromised for personal gain.Examples: "A statement by the Coalition for Lesbian and Gay Rights (CLGR), which organized the protest, charged that WPIX's sale of air time to the Anita Bryant Ministries "is a sell-out of the more than one million lesbians and gay residents in the WPIX broadcast service area."; "When his hearing came up, the sellout of Taiwan was particularly on my mind. I asked him if he thought that Taiwan should be pressured into making an accommodation with the Communist government in Beijing. The candidate refused to answer my question."idiomaticinformal

2. (informal, idiomatic) A person who sells out, who compromises their principles for financial gain or some other advantage.Examples: "The rock star used to be hardcore, but now he's just a sellout."; "The nineties were not an age for the aspirant. The worst thing you could be was a sellout, and not because selling out involved money. Selling out meant you needed to be popular, and any explicit desire for approval was enough to prove you were terrible."idiomaticinformal