/ ˈgreɪvi; NAmE / noun [ U ]
1.
a brown sauce made by adding flour to the juices that come out of meat while it is cooking
2.
( NAmE , informal ) something, especially money, that is obtained when you do not expect it
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WORD ORIGIN
Middle English (denoting a spicy sauce): perhaps from a misreading (as gravé ) of Old French grané , probably from grain spice, from Latin granum grain.