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1.
When a TV channel starts airing programs that are different from what the name of the channel suggests or programming the channel has shown in the past. Channels that exhibit channel drifting tend to shift away from past programming, often acting like it never even existed.

Examples include MTV, Cartoon Network, and TLC.
Channel drifting is often very unpopular with a network's longtime viewers. Of all the people who watched Cartoon Network 10-15 years ago, how many of those people do you think still watch it?
by GaaraoftheDamned March 28, 2013