sun (v.)youdaoicibaDictYouDict[sun 词源字典]
1510s, "to set something in the sun," from sun (n.). Intransitive meaning "expose oneself to the sun" is recorded from c. 1600. Sun-bathing is attested from c. 1600.[sun etymology, sun origin, 英语词源]
vent (v.)youdaoicibaDictYouDict
late 14c., "emit from a confined space," probably a shortening of aventer "expose oneself to the air" (c. 1300), from Old French eventer "let out, expose to air," from Vulgar Latin *exventare, from Latin ex- "out" + ventus "wind" (see wind (n.1)). Sense of "express freely" first recorded 1590s. Sense of "divulge, publish" (1590s) is behind phrase vent one's spleen (see spleen). Related: Vented; venting.