noun, plural hickeys.
1. Slang. b.
a reddish mark left on the skin by a passionate kiss.
any device or gadget whose name
is not known or is momentarily forgotten.
Electricity. a fitting used to mount a lighting fixture in an outlet box or on a pipe or stud.
a tool used to bend tubes and pipes.
Americanism; of obscure origin; senses under def. 1 perhaps a separate word, though the development “device > defective device > defect, blemish, mark” is also possible; cf. doohickey