To force someone to leave the country that they are in. Often said of people who are in a country that they were not born in. You'll be deported if you don't get your visa paperwork in order.
See also: deport
deport someone (from some place) (to some other place)
to expel or exile someone from one place to another, usually back to their prior country of residence. The government deported Jane from this country to her homeland. They deported Tom to Brazil from this country.