An interesting investigation into an idiom that has been claimed to be Irish. The OED (1901) notes ‘origin obscure: It has been stated to be Yiddish or Anglo-Hebraic’.
In Daniel Cassidy’s worthless book of fake etymology, he claimed that the word kibosh or kybosh is of Irish origin. Cassidy was certainly not the first to claim this and his sole authority for saying it was a website called Cork Slang Online. The usual claim in relation to its supposed Irish origin is that it comes from caidhp bháis or caidhp an bháis or caip bháis, meaning a cap or cape of death. Some sources also mention cie báis, but cie is not a possible word in Irish orthography.
While caidhp bháis is given as the name of a fungus in Irish dictionaries (the death cap), there is no evidence that this is an ancient expression and it may have been composed on the pattern of the English phrase death cap in the 20th century.
There are various explanations for the meaning of caidhp bháis as…
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