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check on▼verb[UK: tʃek ɒn ˈsʌm.θɪŋ] [US: ˈtʃek ɑːn ˈsʌm.θɪŋ]
check up on▼verb[UK: tʃek ʌp ɒn ˈsʌm.bə.di] [US: ˈtʃek ʌp ɑːn ˈsʌm.ˌbɑː.di]
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