buzzkill

Pronunciation: /ˈbʌzkɪl/

The English word “buzzkill” has 2 meanings listed here.

noun

Something that or someone who spoils an otherwise enjoyable event.
A person who attends a social event and occupies their time with unsociable activities.

From buzz (“feeling of energy or excitement”) + kill.

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Definitions are from Wiktionary, extracted by Kaikki.org, and are available under the CC BY-SA 4.0 licence.