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gres (chelebh, "fat," "suet"):
The word occurs once in the metaphorical sense "prosperous," then dull, gross, brutal: "Their heart is as fat as grease" (Psalms 119:70; compare Isaiah 6:10, and see FAT).
Orr, James, M.A., D.D. General Editor. "Entry for 'GREASE'". "International Standard Bible Encyclopedia". 1915.