/ dregz; NAmE / noun [ pl. ]
1.
the last drops of a liquid, mixed with little pieces of solid material that are left in the bottom of a container :
coffee dregs
2.
the worst and most useless parts of sth :
the dregs of society
3.
( literary ) the last parts of sth :
the last dregs of daylight
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WORD ORIGIN
Middle English : probably of Scandinavian origin and related to Swedish drägg (plural).