Pronunciation: [tˈɜːnɪŋ kˈiː] (IPA) 
The proper spelling of "turning key" includes two syllables, with the stress on the first. In IPA phonetics, the first syllable is transcribed as /ˈtɜːrnɪŋ/ with a long "e" sound and the second syllable as /ki/ with a short "i" sound. This term refers to a key that is used to turn a lock, usually in a clockwise or counterclockwise motion. It is an essential tool for securing a door or unlocking it.
A turning key is a mechanical device or tool that is designed to activate or operate a lock mechanism in order to secure or unlock a door, a box, or any other compartment. It consists of a small usually metal object, shaped like a long rod or bar, with one end being flat and the other featuring a specific design, such as a groove or a combination of grooves and teeth.
The process of using a turning key involves inserting the flat end into the keyhole of the lock and then rotating it in a specific direction, applying force and precision. The key's unique design matches the lock's internal mechanism and allows for the alignment of various pins, tumblers, or other components, ultimately enabling the lock to be turned and unlocking the device.
Turning keys have been employed for centuries as a reliable and secure method of controlling access to doors and protected areas. They can be found in a multitude of environments, ranging from residential households and commercial buildings to vehicles and safes. Due to the advancement of technology, turning keys now have various designs and structures to accommodate different types of locks, such as pin tumbler locks, wafer locks, or disc detainer locks.
Overall, the turning key is an indispensable tool that ensures security by manipulating lock mechanisms and granting or denying access to certain areas or objects.
The word "turning key" consists of two parts: "turning" and "key".
The term "turning" derives from the verb "turn", which has Old English roots. It can be traced back to the Old English word "tyrnan" or the Middle English word "turnen". The word "turn" refers to the action of rotating or causing something to rotate.
The word "key" comes from Old English "cǣg", which was derived from Old Norse "kaugr". The term has a long history and originally referred to a device used for unlocking or securing something.
When combined, "turning key" refers to a type of key that must be rotated or turned to operate a lock or other mechanism.
