Quiz: Remember the definition of mal de mer?
c.1300 (implied in surname Dryngedregges), from Old Norse dregg "sediment," from Proto-Germanic *drag- (cf. Old High German trestir, German Trester "grapeskins, husks"), from PIE *dher- (1) "to make muddy." Replaced Old English cognate dræst, dærst "dregs, lees." Figurative use is from 1530s.
(Ps. 75:8; Isa. 51:17, 22), the lees of wine which settle at the bottom of the vessel.