O.E. scimerian "to glitter," related to (perhaps a frequentative of) scimian "to shine," also "grow dark," and scinan (see shine). Ultimately from P.Gmc. *skim- (cf. Swed. skimra, Du. schemeren "to glitter," Ger. schimmern), from PIE base *skai- "to gleam, to shine." The noun is attested from 1821, from the verb.