IPA: //ˈdɛrɪŋər//
KK: /ˈdɛrɪŋər/
A small, easily concealable pistol, often used for self-defense or as a backup weapon.
He carried a deringer in his pocket for protection.
Deringer → The word 'deringer' originates from the name of the American gunsmith Henry Deringer, who created a small, easily concealable pistol in the 19th century. The term has since come to refer to similar types of small firearms.
Think of Henry Deringer, the gunsmith who made a small, easily hidden pistol — that's why a 'deringer' refers to this type of firearm.