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be up to▼(to do or be involved in doing)
verb
[UK: bi ʌp tuː ˈsʌm.θɪŋ] [US: bi ʌp ˈtuː ˈsʌm.θɪŋ]

get up to▼(to do something, especially something that you should not do)
verb
[UK: ˈɡet ʌp tuː ˈsʌm.bə.di] [US: ˈɡet ʌp ˈtuː ˈsʌm.ˌbɑː.di]