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megahit
megahit n.
Brit. 
/ˈmɛɡəhɪt/
, /ˈmɛɡəhɪt/U.S. /ˈmɛɡəˌhɪt/
an extremely successful film, television programme, song, etc.; frequently attributive./ˈmɛɡəˌhɪt/ΚΠ
1977 Washington Post 10 July h1/6 If you just couldn't get enough of that super-duper megahit of the '70s, ‘Star Wars’, now you can take eight minutes of it home with you and play it over and over.
1993 Chatelaine May 75/3 In 1991, the megahit was a song called Smells Like Teen Spirit.
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