Meaning of the word "looker on" in English

What does "looker on" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

looker on

US /ˈlʊkər ɑn/
UK /ˈlʊkər ɒn/

Noun

a spectator; someone who watches an event without taking part in it

Example:
The crowd of lookers-on grew as the street performance continued.
He was merely a looker-on, not involved in the argument.