英语词源字典 - 在线词源网站

blush (v.)[blush 词源字典]: mid-14c., bluschen, blischen, probably from Old English blyscan "blush, become red, glow" (glossing Latin rutilare), akin to blyse "torch," from Proto-Germanic *blisk- "to shine, burn," which also yielded words in Low German (Dutch blozen "to blush") and Scandinavian (Danish blusse "to blaze; to blush"); ultimately from PIE *bhel- (1) "to shine, flash, burn" (see bleach (v.)).

For vowel evolution, see bury. Earliest recorded senses were "to shine brightly; to look, stare." Sense of "turn red in the face" (with shame, modesty, etc.) is from c. 1400. Related: Blushed; blushing.[blush etymology, blush origin, 英语词源]
glare (v.): late 13c., "to shine brightly," from or related to Middle Dutch, Middle Low German glaren "to gleam," from Proto-Germanic *glaz-; the whole group represents a rhoticization of the root of glass (n.). Sense of "stare fiercely" is from late 14c. Related: Glared; glaring.
glimmer (v.): late 14c., "to shine brightly;" early 15c., "to shine dimly," perhaps from or related to Middle Dutch glimmen, Middle Low German glimmern, from an extended (frequentative?) form of Proto-Germanic *glim-, root of Old English glæm "brightness" (see gleam (n.)). Sense shifted 15c. to "shine faintly." Compare Dutch glimmeren, German glimmeren "to shine dimly." Related: Glimmered; glimmering.