"Lock, stock, and barrel" is a merism used predominantly in the United Kingdom and North America, meaning "all", "total" or "everything". It derives from the effective portions of a gun: the lock, the stock, and the barrel.
History
The term was first recorded in the letters of Sir Walter Scott in 1817, in the line "Like the High-landman's gun, she wants stock, lock, and barrel, to put her into repair."[1] It is, however, thought that this term evolved into a popular saying some years before in England.[citation needed][2]
Common uses
Politician Mike Pence, Vice President of the United States under Donald Trump, has heavily favored the phrase since at least 2010[3][4] when urging for the repeal of Obamacare, and used the phrase extensively during and after the 2016 presidential campaign.[5][6][7]