(US, rail transport, historical, chiefly in the plural) A segment of rail that has been heated and twisted into a loop, as a means of destroying a railway.

(fashion) A boat neckline

(fashion) A heart-shaped style of neckline that accentuates décolletage

(fashion) A nautically-inspired wide neckline that runs horizontally, front and back across the collarbone

(historical) A kind of necklace supposed to have medicinal properties, particularly for teething children.

Alternative form of Sherman necktie

An apparent paradox within the subjectivistic interpretation of probability theory, in which two people wager over whose necktie is cheapest, with the owner of the more expensive tie giving it to the other. Taking the wager seems to be to the advantage of both people.

Alternative form of rubbernecker

(countable) A surname from French. / Ellipsis of Necker Island.; An island in the Northwestern Hawaiian Islands, Hawaiian Islands, Pacific Ocean in Hawaii, United States; named after Jacques Necker

Ellipsis of Necker Island. An island in the British Virgin Islands, United Kingdom, in the West Indies, Caribbean, Atlantic Ocean; named after Jonathan de Neckere