An example of monitor is for a person to carefully watch her diet.
An example of monitor is a proctor at a standardized test.
The sound engineer detected a hiss on the monitor.
Monitor a suspected criminal's phone conversations.
Monitor the bear population of a national park; monitored the political views of the people.
Monitored the city's drinking water for impurities.
Monitor an examination.
A baby monitor in a nursery.
The camp monitors look after the children during the night, when the teachers are asleep.
The information flashed up on the monitor.