Many etymologists will say that the word was just a noisy nonsense exclamation that imitated the thing it referred to. But there is a theory, put forward by Walther von Wartberg, that it actually comes from the Hebrew 'barukh habba', "welcome" - literally "blessed be the one who comes" - a phrase that appears several times in the Book of Psalms and which is used in Synagogue prayers and as a greeting at Jewish weddings and other public occasions. You might think that this is just another case of folk wisdom guessing on the basis of slight resemblance, but there is evidence to suggest it may be correct. There's a similar word in the Arezzo dialect of Italian, 'barruccaba', that is without doubt borrowed from the Hebrew, and phrases in several other languages suggest that other Hebrew expressions were similarly borrowed.
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