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!
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.