(UK politics) A directive to MPs from party leaders to vote in a particular way in parliament, despite what the MP might believe or what his or her constituents might like.

plural of double yellow line

A symbol in musical notation used to subdivide long measures into shorter segments for ease of reading.

plural of double bar line

plural of dotted bar line

A symbol in musical notation used to separate two sections or phrases of music.

plural of command line interface

(idiomatic) To accumulate personal wealth, especially in an illegal or morally objectionable manner.

plural of free-throw line

(finance) A line representing the relationship between expected return and standard deviation.