necktie (n.)

"that part of an animal body between the head and the trunk and which connects those parts," Middle English nekke, from Old English hnecca "neck, nape, back of the neck" (a fairly rare word) from Proto-Germanic *hnekk- "the nape of the neck" (source also of Old Frisian hnekka, Middle Dutch necke, Dutch nek, Old Norse hnakkr, Old High German hnach, German Nacken "neck"), with no certain cognates outside Germanic, though Klein's sources suggest PIE *knok- "high point, ridge" (source of Old Irish cnocc, Welsh cnwch, Old Breton cnoch "hill").

The more usual Old English words were hals (the general Germanic word, cognate with Gothic, Old Norse, Danish, Swedish, Dutch, German hals), from Proto-Germanic *halsaz, which is perhaps cognate with Latin collum (see collar (n.)); and sweora, swira "neck, nape," probably also from a PIE root meaning "column" (cognate with Old English swer "column," Sanskrit svaru- "post").

Oxen and other draught animals being yoked by the neck, it became a symbol of burdens, of submission or subjugation, and also resistance or obstinacy (compare stiff-necked). Figuratively, "life" (late 15c.) from the breaking or severing of the neck in legal executions. Meaning "narrow part at the top of a bottle" is from late 14c.; meaning "part of a garment which covers the neck" is from 1520s. Meaning "long, slender part of a stringed musical instrument" is from 1610s.

Sense of "isthmus, long, narrow strip of land connecting two larger ones" is from 1550s. Phrase neck of the woods (American English) is attested from 1780 in the sense of "narrow stretch of woods;" 1839 with meaning "settlement in a wooded region." To stick (one's) neck out "take a risk" is recorded by 1919, American English. Horses running neck and neck "at an equal pace" is attested from 1799; to win by a neck is from 1823. To be up to the neck "have a lot of" at first (mid-19c.) suggested "fed full," but since c. 1900 it has implied "in deep."

Old English teag, "cord, band, thong, fetter," literally "that with which anything is tied," from Proto-Germanic *taugo (source also of Old Norse taug "tie," tygill "string"), from PIE root *deuk- "to lead" (source also of Old English teon "to draw, pull, drag").

Figurative sense is recorded from 1550s. Sense of "cravat, necktie" (usually a simple one knotted in front) first recorded 1761. The railway sense of "cross-beam between and beneath rails to keep them in place" is from 1857, American English. Meaning "equality between competitors" is first found 1670s, from notion of a connecting link. Tie-breaker is recorded from 1938. The figurative old school tie (1938) in its literal sense was a necktie of a characteristic pattern worn by former students of a particular English school.