" Weather HAMPERS U.S. Offensive in Eastern Afghanistan - U.S. troops searched caves and cleared ridges of al-Qaida diehards Thursday, but sandstorms and high winds grounded helicopters and threatened to disrupt the U.S.-led air and ground offensive."
(Associated Press - Mar 7th, 2002)
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ham-per
Hamper dates from the 14th century and means to restrict the movement of something, or to disrupt by bonds or obstacles