Meaning of “a whole new ballgame” in the English Dictionary

british dictionary

"a whole new ballgame" in British English

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a whole new ballgame

a completely different situation, often one that is difficult or that you know little about:

We'd done a lot of climbing in Scotland but the Himalayas were a whole new ballgame.

(Definition of “a whole new ballgame” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)