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1.
The process of having sold out, especially to a system or body that directly undermines the principles and values you have long adhered to.

Derived from the actions of the leader of the Liberal Democrat party, following the 2010 United Kingdom General Election.

(also: Clegg out, Clegging out)
I just found out that Innocent smoothies have totally Clegged out to Coca-Cola.
by Jacques-Francois May 14, 2010