They know him well by sight.

Could you explain that what does "by sight" here ?

  • Did you check any dictionaries @Hasan?
    – a.RR
    Sep 3, 2018 at 16:31

1 Answer 1


By sight:

by appearance; by recognizing but not through being acquainted.

(Collins Dictionary)

So if you know someon by sight, it means you can recognize them because you often see them, for instance, but not because you know them in person.

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