Trade barriers refer to the restrictions imposed by a country on the flow of goods and services from other countries. Restrictions may take many forms, such as tariffs, quotas, embargoes, and regulations. Synonyms for "trade barrier" include import barrier, export barrier, commercial barrier, protectionism, restrictionism, and free trade obstruction. Import barrier and export barrier refer to the obstacles faced by countries when importing or exporting goods and services. Commercial barrier refers to any obstacle that hinders the efficiency of trade. Protectionism and restrictionism refer to the practice of imposing trade barriers, while free trade obstruction refers to anything that prevents free trade. Overall, these synonyms describe the complexities of international trade and the challenges that businesses face when operating in foreign markets.