be like a dog with a bone

be like a dog with a bone

To be fixated on a particular topic. I was late once, and my boss is like a dog with a bone, bringing it up every chance she gets. Don't mention his ex-wife, or he'll be like a dog with a bone, and we'll hear about her all night long.
See also: bone, dog, like
Farlex Dictionary of Idioms.
See also:
  • have a one-track mind
  • one-track mind, to have a
  • one-track mind
  • argue about (something)
  • argue with
  • stuck on (someone or something)
  • stuck on someone or something
  • a point of honor
  • a point of honour
  • a point of pride