whole new ballgame, a

a (whole) new ballgame

A situation that is completely different from what one is used to or expecting. Living away from home is a whole new ballgame for most young adults. I used to babysit, but having a child of my own is a new ballgame.
See also: ballgame, new
Farlex Dictionary of Idioms.

whole new ballgame, a

A completely altered situation, as in It will take a year to reassign the staff, and by then some will have quit and we'll have a whole new ballgame . This expression comes from baseball, where it signifies a complete turn of events, as when the team that was ahead falls behind. [Colloquial; 1960s]
See also: new, whole
The American Heritage® Dictionary of Idioms by Christine Ammer.
See also:
  • a (whole) new ballgame
  • a different/new ball game
  • a whole new ball game
  • ballgame
  • new ball game
  • a totally different ballgame
  • house and home
  • right you are
  • right you are!
  • adulting