1. To look at, listen to, or think about something carefully. English = attend to, pay attention to
2. To be looking at, listening to, or thinking about something carefully. English = (be) attentive.
3. To have only one thing in your mind most of the time; or to be unable to change your habits and attitudes easily or at all. English = (be) single minded, (be) set in your ways.
4. To be wearing blinkers.