Meaning of the word "bar line" in English

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

bar line

US /ˈbɑːr laɪn/
UK /bɑː laɪn/
"bar line" picture

Noun

a vertical line across a musical staff, marking off a measure

Example:
The conductor emphasized the importance of observing every bar line.
A double bar line indicates the end of a section or piece.