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OK, so which sound was it? Well, another problem here is we don’t even use that sound in English any more, except in a few cases, like for that sound of disgust, that back-of-the-throat rough vibration found at the end of the word blechhhh. Linguists call it a velar fricative. You’ll also find it in yech, ichh, and ughh, but you can hear it in a few more wordy kinds of words too—the composer Bach, words from Yiddish like tuchus or chutzpah or from Scottish like loch or the name Lachlan.
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Arika Okrent (Highly Irregular: Why Tough, Through, and Dough Don't Rhyme—And Other Oddities of the English Language)