Sunrise

wiktionary

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From Middle English sonne-rys, sunne ryse, equivalent to sun +‎ rise. Compare Middle English son risyng, sunne rijsyng, sonne-rysing(“sunrise”, literally “sun rising”).

etymonline

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sunrise (n.)

mid-15c., from sun (n.) + rise (v.); perhaps it evolved from a Middle English subjunctive, such as before the sun rise. Earlier in same sense were sunrist (mid-14c.); sunrising (mid-13c.). Compare sunset.