port of entry
port of entry {n. phr.}
1. A port where things brought into the country to sell may pass through customs.
Other ports of entry have been taking business from New York.
2. A port where a citizen of another country may legally enter a country; a port having passport and immigration facilities.
Airports have joined seaports as ports of entry for the visiting foreigner.
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Source: A Dictionary of American Idioms
