Impede v. t. : To hinder; to stop in progress; to obstruct; as, to impede the advance of troops.

Example:
What is a trade barrier? How does a trade barrier Impede a country’s access to the export markets?

Taxonomy
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Defination from the web:
impede from the Merriam-Webster Online Dictionary with audio pronunciations, thesaurus, Word of the Day, and word games. ... Learn more about "impede" and related topics at Britannica.com. Pronunciation Symbols. Share this entry: Link to this page: Cite this page: Products ...