An embargo, or trade embargo, was the prohibition of commerce and trade with a certain entity.
During the Coalition of Planets negotiations, Tellarites pushed for an embargo against trade with the Orions, though the Coridanites would have nothing of it. (ENT: "Demons")
In 2366, Kyril Finn demanded that the Federation institute an embargo against the Rutia IV government until they agreed to the Ansata demands. TNG: "The High Ground")
The Federation maintained a trade embargo against the Romulan Star Empire, most notoriously resulting in the illegality of Romulan ale. The embargo was temporary lifted when the Empire joined the Federation Alliance, but by 2379, Romulan ale had become prohibited again. (DS9: "Inter Arma Enim Silent Leges"; Star Trek Nemesis)