1610s, from French déclivité, from Latin declivitatem (nominative declivitas) "a slope, declivity," from declivis "a sloping downward," from de- "down" (see de-) + clivus "a slope," from PIE *klei-wo-, suffixed form of *klei "to lean" (see lean (v.)).
实用例句
1. I looked frontage straightly , going declivity one by one.
我两眼直视前方,一路下坡又下坡.
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2. He had rolled down a declivity of twelve or fifteen feet.
