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Verb: check up on
  1. Examine so as to determine accuracy, quality, or condition
    "check up on the brakes";
    - check, look into, check out, suss out [Brit], check over, go over, check into, sus [Brit], suss [Brit]

Derived forms: checking up on, checked up on, checks up on

Type of: analyse [Brit, Cdn], analyze [N. Amer], canvass, examine, study