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hobnob [hobnob 词源字典]: hobnob: [18] In Shakespeare’s Twelfth Night, Sir Toby Belch says ‘Hob, nob, is his word: give’t or take’t’; from which it has been deduced that the hob of hobnob represents have and that the nob represents the now obsolete nave ‘not have’ (formed in the Old English period by adding the negative particle ne to have). In Middle English these would have been habbe and nabbe.

When hobnob first appears as a verb, in the mid 18th century, it means ‘drink together’ – perhaps from the notion of buying alternate rounds of drinks, or drinking toasts to each other in turn. The modern sense ‘associate familiarly, socialize’ is not recorded before the early 19th century.
=> have[hobnob etymology, hobnob origin, 英语词源]
sweet (adj.): Old English swete "pleasing to the senses, mind or feelings; having a pleasant disposition," from Proto-Germanic *swotja- (cognates: Old Saxon swoti, Old Frisian swet, Swedish söt, Danish sød, Middle Dutch soete, Dutch zoet, Old High German swuozi, German süß), from PIE root *swad- "sweet, pleasant" (Sanskrit svadus "sweet;" Greek hedys "sweet, pleasant, agreeable," hedone "pleasure;" Latin suavis "pleasant" (not especially of taste), suadere "to advise," properly "to make something pleasant to"). Words for "sweet" in Indo-European languages typically are used for other sense as well and in general for "pleasing."
Then come kiss me, sweet-and-twenty!
Youth's a stuff will not endure.
["Twelfth Night"]
Also "being in a sound or wholesome state" (mid-13c.), and, of water, "fresh, not salt" (late Old English). As an intensifier from 1958. Sweet in bed (c. 1300) was the equivalent of modern "good in bed." To be sweet on someone is first recorded 1690s. Sweet sixteen first recorded 1767. Sweet dreams as a parting to one going to sleep is attested from 1897, short for sweet dreams to you, etc. Sweet-and-sour in cookery is from 1723 and not originally of oriental food. Sweet nothings "sentimental trivialities" is from 1900. Sweet spot is from 1976, first in reference to tennis rackets. Sweet corn is from 1640s.
twelfth (adj.): late 14c., with -th (1), altering Middle English twelfte, from Old English twelfta, from twelf ((see twelve). The earlier form is cognate with Old Norse tolfti, Danish tolvte, Old Frisian twelefta, Dutch twaalfde, Old High German zwelifto, German zwölfte .

As a noun meaning "a twelfth part," from 1550s. Twelfth Night is Old English twelftan niht "Twelfth Night," the eve of Epiphany, which comes twelve days after Christmas, formerly an occasion of social rites and a time of merrymaking.