Meanings
How to pronounce "on sight":
AU
Immediately when sighted.
Example: "I recognized him on sight."
Immediately something has come to one's attention.
An ascent of a route without falling, when one has been advised on it or has seen it.
Example Sentences
1
The security guard is instructed to shoot any intruder on sight.
2
As soon as they saw each other, they recognized each other on sight.
3
The teacher can identify students who cheat on tests on sight.
4
The police officer arrested the thief on sight.
5
The manager fired the employee on sight for stealing.