Shimmer

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late Old English scymrian, of Germanic origin; related to German schimmern, also to shine. The noun dates from the early 19th century.

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From Middle English schimeren, from Old English sċymrian, sċimrian, sċimerian, from Proto-Germanic *skimarōną. Cognate with Dutch schemeren, German schimmern.

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shimmer (v.)

Old English scimerian "to glitter, shimmer, glisten, shine," related to (perhaps a frequentative of) scimian "to shine," from Proto-Germanic *skim- (source also of Swedish skimra, Dutch schemeren "to glitter," German schimmern), from PIE root *skai- "to gleam, to shine" (see shine (v.). Related: Shimmered; shimmering.

shimmer (n.)

"a tremulous light," 1821, from shimmer (v.).