Merriam-Webster's Word of the Day for October 17, 2025 is:
 
 
 
 
 kibosh &#149; \KYE-bosh\&nbsp; &#149; noun
 Kibosh refers to something that serves as a check or stop. It is usually used in the phrase “put the kibosh on” to mean “to stop or end (something)” or “to prevent (something) from happening or continuing.”

// I downloaded an app to help me put the kibosh on my high screen time. 

<a href="https://www.merriam-webster.com/dictionary/kibosh">See the entry ></a>
 
 
 
 Examples:
 “… Maybe, suggests [Graham] Dugoni and other advocates, instead of putting the kibosh on devices entirely, we need to treat modern society like a teenager on a rebellious streak. Rather than saying no, we need to show them support, offer a gentle hand, maybe even make them think it’s their idea. In a way, it’s time for some gentle parenting.” — Chase DiBenedetto, Mashable, 3 June 2025 
 
 
 
 Did you know?
 Evidence of kibosh dates the word to only a few years before Charles Dickens used it in an 1836 <a href="https://www.britannica.com/topic/Sketches-by-Boz">sketch</a>, but despite kibosh being relatively young its source is elusive. Claims were once made that it was Yiddish, despite the absence of a plausible Yiddish source. Another hypothesis pointed to the Irish term caidhp bhais, literally, “coif (or cap) of death,” explained as headgear a judge put on when pronouncing a death sentence, or as a covering pulled over the face of a corpse when a coffin was closed. But evidence for any metaphorical use of this phrase in Irish is lacking, and kibosh is not recorded in English as spoken in Ireland until decades after Dickens’s use. More recent source theories include a heraldic term for an animal’s head when born with only its face fully showing, and an Arabic word meaning “whip, lash,” but as the note at our etymology <a href="https://bit.ly/3VnwO8k">explains</a>, no theory has sufficient evidence to back it.

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