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Definition of mission impossible noun from the Oxford Advanced Learner's Dictionary

mission impossible

noun
 
/ˌmɪʃn ɪmˈpɒsəbl/
 
/ˌmɪʃn ɪmˈpɑːsəbl/
[countable, uncountable]
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  1. a difficult or impossible task
    • Taking a selfie with the Eiffel tower turns out to be a mission impossible, believe me!
    • Sometimes it feels like mission impossible to keep the children's toys neat and tidy.
    Word Origin1960s: after the name of Mission: Impossible, a US television series, first broadcast in 1966.

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