noun
Often implies illegal transport, especially of drugs, but can also refer to a legitimate courier. Context determines legality.
警察は麻薬の運び屋を逮捕した。
The police arrested a drug courier.
彼は運び屋として組織に雇われていた。
He was hired by the organization as a smuggler.
Compound of 運び (carrying, transport) and 屋 (person, dealer). The term originally referred to a professional carrier, but in modern usage it is strongly associated with illegal smuggling.