a double vertical line on a staff indicating the conclusion of a piece of music or a subdivision of it.
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How to use double bar in a sentence
On February 15 of that year he began; on November 19 he ruled the last double-bar and wrote finis.Richard Wagner | John F. Runciman
When over a double bar, indicates where the piece is to be concluded after a repeat.
This is the same use as now made of the double bar in vocal music.A Popular History of the Art of Music | W. S. B. Mathews
It was a moment of delicate poise, and Rolf knew a touch would open the door or double bar it.Rolf In The Woods | Ernest Thompson Seton
Formerly it was invariably played twice, its termination being followed by a double bar with repetition marks.The Life of Johannes Brahms (Vol 1 of 2) | Florence May
British Dictionary definitions for double bar
music a symbol, consisting of two ordinary bar lines or a single heavy one, that marks the end of a composition or a section within it
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012