<good god they're all wearing kilts now>
woofas you don't know how interesting that is! Indeed there is such a phrase
still alive and kicking in the French language, and it seems to be "a French onomatope simulating the sound of a little leap", according to the somewhat arrogant Arbiter
here
Arbiter is probably right but it also just happens to be a fact that even the Swedish word for Jump! is 'hoppa', similar to your own 'hop', so who's to say what came first to the acrobats, the word or the sound, if you see what I mean. Words do go around the world. (I agree that originally it's probably an onomatope, though.) And yes it does seem this would be uttered before performing a trick and not after. It's comedians wot do it after, then. I conclude, then, that there isn't really an English hup word that leads the mind in the same direction as I was after. The comedian says boom boom and the acrobat says hop, only, he does it before, not after. Thanks ever so much, this has been very useful for me.
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PS.
Quizmonster it's okay, really it is, it's just that... well...
you know...
H�pp!