could tell someone a thing or two

could tell someone a thing or two

or

could teach someone a thing or two

If you could tell someone a thing or two about something or could teach someone a thing or two about it, you know much more about it than they do. Perhaps they'd like to meet my sons, now aged 14 and 17. They could tell them a thing or two about drama. They could teach us a thing or two about family values. Note: A thing or two is often used after other verbs to mean a lot of things. Patricia Hewitt knows a thing or two about how to be well-organised. The peace movement has learnt a thing or two from Vietnam.
See also: could, tell, thing, two
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