up to something

形容词 adj.
英 /ˈʌp tuː ˈsʌmθɪŋ/    美 /ˈʌp tə ˈsʌmθɪŋ/

英文释义

形容词 adj.
  1. Doing something mischievous or scheming. idiomatic,not-comparable
    — He looks like an angel, but I can tell he's up to something.
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