netyoudaoicibaDictYouDict[net 词源字典]
net: English has two distinct words net. The commoner and more ancient, ‘mesh’ [OE], is a widespread Germanic word: German has the related netz, Dutch and Danish net, and Swedish nät. Its ultimate origins are not known, although a link with Latin nassa ‘wicker basket for catching fish’ has been suggested. Net ‘without deductions’ [14] comes from French net, which was borrowed into English again two centuries later as neat.

It was originally used, like its French source, for ‘trim, clean’, but this developed via ‘unadulterated, unmixed’ to, by the early 16th century, ‘free from any (further) deduction’. The alternative spelling nett dates from the 16th century.
=> neat[net etymology, net origin, 英语词源]
net (n.)youdaoicibaDictYouDict
Old English net "netting, network, spider web, mesh used for capturing," also figuratively, "moral or mental snare or trap," from Proto-Germanic *natjan (cognates: Old Saxon net, Old Norse, Dutch net, Swedish nät, Old High German nezzi, German Netz, Gothic nati "net"), originally "something knotted," from PIE *ned- "to twist, knot" (cognates: Sanskrit nahyati "binds, ties," Latin nodus "knot," Old Irish nascim "I bind, oblige").
net (adj.)youdaoicibaDictYouDict
"remaining after deductions," 1510s, from earlier sense of "trim, elegant, clean, neat" (c. 1300), from Old French net "clean, pure," from Latin nitere "to shine, look bright, glitter" (see neat). Meaning influenced by Italian netto "remaining after deductions." As a noun, 1910.
net (v.2)youdaoicibaDictYouDict
"to gain as a net sum," 1758, from net (adj.). Related: Netted; netting.
net (v.1)youdaoicibaDictYouDict
"to capture in a net," early 15c., from net (n.). Related: Netted; netting.