[know] {sth} from {sth}
1
to distinguish or identify between two things based on knowledge or familiarity
- I know good coffee from bad just by the smell.
- Can you know right from wrong in such a complex situation?
- She knows a genuine painting from a fake one with ease.
- He claimed to know truth from lies, but his judgment seemed flawed.
- Do you know fact from opinion when reading articles online?