to listen to phone calls, foreign radio broadcasts, etc. in order to find out information that might be useful
نظارت کردن, رصد کردن, استراق سمع کردن, پایش کردن, شنود کردن
a police state where every activity is monitored
We were warned by a friend in the government that our phone calls were being monitored.
The company routinely monitors all its employees' emails.
During the war his job was to monitor enemy radio broadcasts.