downbuckling
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downbuckle — ˈ ̷ ̷ˌ ̷ ̷ ̷ ̷ noun : a generally long and relatively narrow portion of the earth s crust that has been bent sharply downward • downbuckling ˈ ̷ ̷ˌ ̷ ̷( ̷ ̷) ̷ ̷ noun … Useful english dictionary