Frein

Part of speech: noun

Definitions

A device or mechanism used to slow or stop motion, especially in vehicles ; a restraint or control to prevent excessive speed or movement ; an action of holding back or checking progress or activity
An apparatus designed to reduce speed or halt movement, often found in transportation ; a means of limiting or regulating motion to ensure safety or control ; the process of impeding or slowing forward action or development
A system that applies resistance to decrease velocity, commonly implemented in cars or bicycles ; a method of controlling or restraining motion to maintain stability ; an act of restraining forces to prevent rapid advancement or unrestrained activity

Etymology: "Frein" is the French word for "brake," and it is also the source of the English word "frenum" only in a loose sense of sharing a Latin-ancestor-type root through "frenum"... Let me correct that: the French word comes from Latin "frenum," meaning "bridle" or "curb," the strap that restrains a horse's head. The Latin noun is traced to a root connected with binding or fastening, though its exact deeper origin is uncertain. The sense shift from restraining a horse to slowing a machine is the heart of the story. Early French used "frein" for the bit and bridle of a horse, and the idea of checking motion through a restraining device carried over naturally when mechanical stopping devices appeared. A brake on a vehicle is, in effect, a bridle for wheels: it curbs movement rather than forcing it to stop abruptly. English borrowed the word in its own form, "frenum" in medical contexts for a small fold of tissue that restrains movement, such as the one under the tongue. That English medical sense is a close cousin, showing how the same Latin idea of restraint branched into both anatomy and machinery. The vehicle sense itself belongs to the French word, which is the one your term refers to.

Synonyms: rein, bridle, control, restraint, check

Antonyms: release, freedom, liberation, unleashing, discharge