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 coloratura
Pronunciation: ˌkɒlərəˈtjʊərə
noun
elaborate ornamentation of a vocal melody