Perfect or comfortable is the meaning behind snug as a gun.
"Snug as a gun," is a figure of English speech. It regards a person or object being highly comfortable and settled in their environment. Its basis is from a firearms being safe and secured (or snug) in a holster, against movement, damage and loss.
The first meaning could refer to firing a gun with blanks inside of it instead of bullets. The second meaning could refer to a man who is impotent in the bedroom.
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Troubleshooter isn't an idiom because it's not a phrase. It's SLANG meaning someone who looks for trouble and fixes it. Think of someone with a gun trying to shoot and destroy spots of trouble and you'll see the meaning.
A bullet fired from a gun
The phrase "Johnny got his gun" was first popularized by the novel written in 1938 by author Dalton Trumbo. This novel was published in the year 1939.
Taditionally, this was the "lock, stock, and barrel". The stock or grips permits the shooter to hold the gun, the barrel guides the projectiles. The lock, or action, controls the firing of the cartridge or charge. Lock, stock and barrel has become a phrase meaning the entire thing.
fois shìorraidh gun robh aig a h-anam(rest her soul in peace)fois shìorraidh gun robh aig a anam(rest his soul in peace)
Originally, to discharge a gun, you lit the gunpowder, and set the powder on fire- or "fired" it.
Those are dates when a portion of the gun was patented.
Cowboys loved a colorful phrase! This one means a pistol or gun. The image is of the gun "talking" as it goes off.