from Wiktionary, Creative Commons Attribution/Share-Alike License.
- verb idiomatic To undergo a
storylinedevelopment which heralds a fundamental and generally disappointingchange in direction.
- verb more generally To experience a
declinein quality, appeal, popularity, etc.
from Wiktionary, Creative Commons Attribution/Share-Alike License
From "Hollywood (Part 3)", a 1977 episode of the TV series Happy Days, in which the character Fonzie jumped over a shark on waterskis, after which (supposedly) the show bore no similarity to its original form.
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