Definition of know someone by sight in English:

know someone by sight

Recognize someone by their appearance without knowing their name or being so well acquainted as to talk to them.
More example sentences
  • The woman and her family moved here from France sometime earlier this year, I didn't know her name but I knew her by sight.
  • We all knew them by sight and they seemed a truly lovely family.
  • I had known his brother very well at junior school and I knew Freddie by sight.
See parent entry: know

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Word of the day animalcule
Pronunciation: ˌanɪˈmalkjuːl
noun
a microscopic animal