Definition of by sight
: on the basis of one's looks I know her by sight but not by name.
Word by Word Definitions
: something that is seen : spectacle
: something ludicrous or disorderly in appearance
: a great number or quantity
: to get or catch sight of
: to look at through or as if through a sight
: to test for straightness
: based on recognition or comprehension without previous study
: payable on presentation
Seen and Heard
What made you want to look up by sight? Please tell us where you read or heard it (including the quote, if possible).