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hiss [hissed, hissing, hisses]▼verb[UK: hɪs] [US: ˈhɪs]
hiss at▼verb[UK: hɪs ət] [US: ˈhɪs ət]
booing▼noun[UK: ˈbuːɪŋ] [US: ˈbuːɪŋ]
groan down a speaker▼[UK: ɡrəʊn daʊn ə ˈspiːkə(r)] [US: ˈɡroʊn ˈdaʊn ə ˈspiːkər]
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