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killjoy (n.)

also kill-joy, 1776, from kill (v.) + joy. Kill formerly was used with other stems (for example kill-courtesy "boorish person," kill-cow "bully, big man," etc.; also compare Kellogg).

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Definitions of killjoy from WordNet

killjoy (n.)
someone who spoils the pleasure of others;
Synonyms: spoilsport / wet blanket / party pooper
From wordnet.princeton.edu