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be up to mischief▼[UK: bi ʌp tuː ˈmɪs.tʃɪf] [US: bi ʌp ˈtuː ˈmɪs.tʃəf]
be up to no good▼[UK: bi ʌp tuː nəʊ ɡʊd] [US: bi ʌp ˈtuː ˈnoʊ ˈɡʊd]
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