on sight prepositional phrase 3noun 1forms 1 prepositional phrase3 •Immediately when sighted.I recognized him on sight. •Immediately upon coming to one's attention.He dismissed the idea on sight. •(slang) cause for a fight, immediately upon encounter without deliberation.If he keeps talking crap about me, its on sight. noun1 •An ascent of a route without falling, on the first attempt, without having been advised on it or having seen it prior. formson sights
