What does 'buzzkill' mean?

What does the English idiom 'buzzkill' mean? Improve your English vocabulary with this free 3-minute English language tutorial.
You'll find a free downloadable transcript on our website: www.bbc.co.uk/l...
Neil and Feifei have just reached the top of a mountain when… Neil’s phone rings. But who is calling, and is it good news? What a 'buzzkill'! Learn all about this expression in this programme. And turn off your phone next time, Neil!
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