Strong's Hebrew: 6937. qadar (kaw-dar')
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6937. qadar (kaw-dar')
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A primitive root; to be ashy, i.e. Dark-colored; by implication, to mourn (in sackcloth or sordid garments) -- be black(-ish), be (make) dark(-en), X heavily, (cause to) mourn.
Strong's Numbers Online Bible Dictionary