Lose Status:

To stay in the United States longer than the period of time which the DHS gave to a person when he/she entered the United States, or to fail to meet the requirements or violate the terms if the visa classification.  The person become “out of status.” For example, you entered the U.S. on a student visa to study at a university.  You work at your uncle’s convenience store without authorization, and do not study.  You have lost status and thus “out of status.”