Definition of "on sight" in English

Prepositional phrase

1. Immediately when sighted.

   • I recognized him on sight.

2. Immediately upon coming to one's attention.

   • He dismissed the idea on sight.

3. cause for a fight, immediately upon encounter without deliberation.

   • If he keeps talking crap about me, its on sight.

Noun

1. An ascent of a route without falling, on the first attempt, without having been advised on it or having seen it prior.