a totally different ballgame

a totally different ballgame

A situation that is completely different from what one is used to or expecting. Living away from home is a totally different ballgame for most young adults. I used to babysit, but having a child of my own is a totally different ballgame.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
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It will be a totally different ballgame against Korea on Monday.