keep somebody guessing

keep (one) guessing

To withhold information from someone so they don't know what will happen or what one will do next. I feel like my girlfriend is always trying to keep me guessing. I just never feel totally comfortable with her. In show business, it's important to keep your audience guessing, to keep them engaged.
See also: guess, keep
Farlex Dictionary of Idioms.

keep somebody ˈguessing

(informal) not tell somebody about your plans or what is going to happen next: It’s the kind of book that keeps you guessing right to the end. OPPOSITE: give the game away
See also: guess, keep, somebody
Farlex Partner Idioms Dictionary
See also:
  • keep (one) guessing
  • keep (one) hanging (in midair)
  • have it in for, to
  • leave (one) hanging
  • leave (one) hanging in midair
  • leave hanging
  • girlfriend
  • make with
  • make with the (something)
  • be in a snit