(1)
"Stadium horns -or vuvuzelas- require a pucker, lots of puff and some practice, advise experts" : read the article from the Guardian.
Just click on :
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(1) Photo by kjpm, licensed under CC BY-NC
a pucker (faire la) grimace, la moue, plisserr les lèvres
require = (here) need
puff (souffle)