To run smoothly; move freely, as the tongue.To make smooth; cause to run smoothly, as the tongue; make glib.Smooth; slippery: as, ice is glib.Running smoothly or sleekly; plausibly voluble: as, a glib tongue.n. A bushy head of hair, formerly common among the Irish. See the extracts.n. A man wearing such a bush of hair.To castrate.