in theory

in theory

Hypothetically; as a possibility. As opposed to in reality or in practice. In theory, we could drive to the mountains for a quick ski session before our flight tomorrow evening, but I think it would be cutting it too close. These magnets are supposed to regulate the body's natural energy, in theory anyway.
See also: theory
Farlex Dictionary of Idioms.

in theory

according to a theory; theoretically. In theory, if I take my medicine regularly, I will get well. How things work in theory doesn't always match with how things work in reality.
See also: theory
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.

in ˈtheory

used to say that a particular statement is supposed to be true but may in fact be wrong: In theory, these machines should last for ten years or more. That sounds fine in theory, but have you really thought it through?
See also: theory
Farlex Partner Idioms Dictionary
See also:
  • within arm's reach
  • so clean (that) (one) could eat off the floor(s)
  • so clean you could eat off the floor
  • look at (one) cross-eyed
  • look at cross-eyed
  • get a thick ear
  • give somebody/get a thick ear
  • move mountains
  • in reality
  • IRL