a thing or two

a thing or two

Some varying amount of pertinent information or pointed criticism (about something). Hey, I know a thing or two about art—I was an art history major in college, you know! It was my plan to go in and tell the boss a thing or two about the company's crappy work environment, but when he offered me a huge promotion I didn't exactly feel prepared to have it out with him.
See also: thing, two
Farlex Dictionary of Idioms.

*thing or two (about someone or something)

 
1. bits of information or criticism about someone or something; a few facts about someone or something. (Typically: find out ~; know ~; learn ~; tell someone ~.) I told Bob a thing or two about cars. I know a thing or two about Mary that would really shock you.
2. a few points of criticism about someone or something. (Typically: tell some-One ~.) I told her a thing or two about her precious little boy! Let me tell you a thing or two about your messy yard!
See also: thing, two
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.

thing or two

Quite a lot, as in You can count on Bob to tell you a thing or two about Iran. This term is nearly always an understatement. [Mid-1800s] Also see under know all the answers.
See also: thing, two
The American Heritage® Dictionary of Idioms by Christine Ammer.
See also:
  • thing or two
  • express (oneself)
  • express oneself
  • art
  • art for art's sake
  • be art and part of
  • be art and part of (something)
  • have a thing about
  • have a thing about (someone or something)
  • get (a lot of) stick (from someone)