know (all) too well

know (all) too well

To be very familiar with something, usually something difficult, bad, or unpleasant. A noun or pronoun can be used between "know" and "(all) too well." Trust me, I've got three kids under six, so I know too well how debilitating sleep deprivation can be. A: "Do you have any idea how stressful the application process is?" B: "I know it all too well. I went through it myself several years ago."
See also: know, well
Farlex Dictionary of Idioms.
See also:
  • add in
  • (you) wanna make something of it?
  • all for the best
  • a straw will show which way the wind blows
  • all right
  • a/the feel of (something)
  • (I) wouldn't (do something) if I were you
  • a crack at (someone or something)
  • (do) (you) want to make something of it?
  • a thing of the past