know chalk from cheese
know chalk from cheese
To be able to tell two things apart (especially by recognizing their differences). Of course I know which twin is which, I know chalk from cheese, after all! Leah has a beauty mark under her left eye, and Deena doesn't.
See also: chalk, cheese, know
Farlex Dictionary of Idioms.
- know a hawk from a handsaw
- as we know it
- I know
- before you know where you are
- by any chance
- AFAIK
- closed book, a
- a closed book
- before you know it
- (I) can't say as I do