Etymology
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ballgame (n.)

also ball-game, 1848, from ball (n.1) + game (n.).

updated on March 21, 2017

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Definitions of ballgame from WordNet

ballgame (n.)
a particular situation that is radically different from the preceding situation;
HDTV looks the same but it's really a whole new ballgame
Synonyms: new ballgame
ballgame (n.)
a field game played with a ball (especially baseball);
Synonyms: ball game
From wordnet.princeton.edu, not affiliated with etymonline.