sneezeyoudaoicibaDictYouDict[sneeze 词源字典]
sneeze: [15] The Old English word for ‘sneeze’ was fnēsan, a distant relative of Greek pneuma ‘breath’ (source of English pneumatic). This survived into Middle English as fnese. The letters f and s were very similar in medieval script, so it could have played a part in the late 15th-century emergence of sneeze. Fnese had largely died out by the early 15th century, and it could well be that when printing got into full swing in the 1490s, with many old manuscript texts being reissued in printed form, printers unfamiliar with the old word fnese assumed it had the much more common initial consonant cluster sn-.

Another factor in the equation is the now obsolete verb neeze ‘sneeze’. This was borrowed in the 14th century from Old Norse hnósja, a descendant of the Indo-European base *ksneu-, which also produced German niesen, Dutch niezen, Swedish nysa, Danish nyse, and Russian chikhat’ ‘sneeze’. It bridged the gap between fnese and sneeze, and the new sneeze no doubt struck people as a more expressive alternative to the old neeze. (Both fnese and neeze go back ultimately to an imitation of the sound of breathing, blowing, or sneezing.)

=> pneumatic[sneeze etymology, sneeze origin, 英语词源]
sneeze (v.)youdaoicibaDictYouDict
late 15c., from Old English fneosan "to snort, sneeze," from Proto-Germanic *fneusanan (compare: Middle Dutch fniesen, Dutch fniezen "to sneeze;" Old Norse fnysa "to snort;" Old Norse hnjosa, Swedish nysa "to sneeze;" Old High German niosan, German niesen "to sneeze"), from Proto-Germanic base *fneu-s- "sneeze," of imitative origin, as is PIE *pneu- "to breathe" (source of Greek pnein "to breathe").

Other imitative words for it, perhaps in various ways related to each other, include Latin sternuere (source of Italian starnutare, French éternuer, Spanish estornudar), Breton strevia, Sanskrit ksu-, Lithuanian čiaudeti, Polish kichać, Russian čichat'.

English forms in sn- might be due to a misreading of the uncommon fn- (represented in only eight words in Clark Hall, mostly in words to do with breathing), or from Norse influence. OED suggests Middle English fnese had been reduced to simple nese by early 15c., and sneeze is a "strengthened form" of this, "assisted by its phonetic appropriateness." Related: Sneezed; sneezing. To sneeze at "to regard as of little value" (usually with negative) is attested from 1806.
sneeze (n.)youdaoicibaDictYouDict
"act of sneezing," 1640s, from sneeze (v.).