ON SIGHT

{adv. phr.} 1. The first time the person or thing is seen; as soon as the person or thing is seen. * /First graders learn to read many words on sight./ * /Mary had seen many pictures of Grandfather, so she knew him on sight./ Compare: AT ONCE(1). 2. On demand, on asking the first time. * /The money order was payable at sight./