Every now and then, a young person who is grounded is banned from leaving home or his/her room to go anywhere other than to attend required activities such as school, meals, church, music practice, etc. Grounding does not necessarily mean people are unable to come over, only going out is prohibited. It is commonly combined with the withdrawal of privileges such as the use of computer, Internet, video games, television, telephone, cars, mobile phones, prom, slumber party, shopping malls, movie theaters, iPod, Summer Camp, etc., and some children may even be sent to bed early. Some groundings can last from as short as a day or two, to as long as a month or year, while some last an indefinite amount of time.
The term most likely originated in the aviation community. When an aviator is restricted from flying due to misconduct, illness, or other reasons they are said to be "grounded."