Nonsense or foolish talk; something that is completely untrue or doesn't make sense.
From Turkish 'boş,' meaning 'empty' or 'worthless.' The word entered English in the mid-1800s during increased contact with Ottoman culture, and it quickly became British slang for ridiculous or meaningless speech.
Victorian and British authors loved using 'bosh' to express dismissal, and you can hear it in Sherlock Holmes stories—it's the perfect word for calling out bs without being crude, which is probably why it survived while many other slang words faded away!
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