- Today's Word
Kibosh
[KY-bosh]
Definition
- (noun) To stop or put an end to it, often suddenly or decisively. It’s used to describe the act of halting plans, ideas, or activities, typically in a final or authoritative.
Example
The principal put the kibosh on the students’ plans for an unsupervised overnight party, citing safety concerns and school policy.
Fun Fact
The origin of “kibosh” is somewhat mysterious and hotly debated among etymologists. One theory suggests it comes from the Irish phrase “cie bais,” meaning “cap of death” (referring to a judge’s black cap worn when pronouncing a death sentence). Another theory links it to the Yiddish word “kabas,” meaning “to suppress.” Yet another suggests it might come from the word “kurbash,” a type of whip used for punishment in some Middle Eastern countries. Despite its unclear origins, “kibosh” entered English slang in the early 19th century and has been putting a stop to things ever since.
(adjective) Deliberately untrustworthy and deceitful; guilty of betraying trust or breaking faith.
The perfidious advisor had been leaking confidential strategy to competitors for years, all while accepting promotions and praise from the company he was quietly destroying.
Perfidious derives from the Latin perfidiosus, meaning “treacherous,” rooted in perfidia — “faithlessness” — built from per- (“through” or “away”) and fides (“faith” or “trust”). The same root fides gives us fidelity, confide, and fiduciary — making perfidious the dark twin of an entire family of words built on trust and loyalty. It entered English in the 16th century and has carried its sense of calculated, deliberate betrayal ever since.