up to something
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- (Received Pronunciation) IPA(key): /ˈʌp tuː ˈsʌmθɪŋ/
- (General American) IPA(key): /ˈʌp tə ˈsʌmθɪŋ/
- Hyphenation: up to some‧thing
- (idiomatic) Doing something mischievous or scheming.
- He looks like an angel, but I can tell he’s up to something.