1. Examine so as to determine accuracy, quality, or condition
   "I'll check into it";
   - check, check up on, look into, check out, suss out [Brit, informal], check over, go over, suss [Brit, informal], sus [Brit, informal]
    
2. Register at a hotel or similar establishment
   "We'll check into the hotel around 3pm"

Derived forms: checked into, checks into, checking into

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