There’s an important issue here that you’re all missing: how to pronounce the word ‘kibosh’?
I’ve noticed it becoming more popular in American discourse lately, but with a variant pronunciation to what I’m used to. The way I’ve always heard it in Blighty is with a long ‘aye’ sound and stress in the first syllable — “KY-bosh”. But I’m hearing it lately on YouTube and US news reports with a short ‘i’ sound and no stress — “kib-osh”.
Clearly, the new pronunciation is wrong </irony>, but equally clearly the US will dominate and pretty soon everybody will be saying “kib-bosh” and looking at me funny for pronouncing it the way I’ve always heard it up to now.