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when a TV show adds another younger character because the previous younger character(s) on that show has become too old and outgrown their cuteness.

Term originates from when The Brady Bunch introduced a new character named cousin oliver (in what turned out to be the final six episodes of the show) because all the cute kids grew up.
when raven - symone was added to the cast of the Cosby Show because Bill thought Keisha outgrew her cuteness

pull a cousin oliver example numer dos: Malcolm in the middle, when Lois got pregnant around the 4th season.
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