bar line

1. 1.

   a vertical line before the accented beat marking the boundary between musical bars

   Broaderlinemusical notation

   Narrowerdouble bar

Questions about bar line

What does bar line mean?

bar line means "a vertical line before the accented beat marking the boundary between musical bars".

Is bar line a common word?

bar line is banded "Uncommon" — turns up in careful writing rather than conversation. The band comes from how often the word appears in a large corpus of everyday English, not from an editor's impression.