Hob

[hob] /hɒb/

noun
1.
a projection or shelf at the back or side of a fireplace, used for keeping food warm.
2.
a rounded peg or pin used as a target in quoits and similar games.
3.
a game in which such a peg is used.
4.
Machinery. a milling cutter for gear and sprocket teeth, splines, threads, etc., having helically arranged teeth and fed across the work as the work is rotated.
verb (used with or without object), hobbed, hobbing.
5.
Machinery. to cut with a hob.
[hob] /hɒb/
noun
1.
a or elf.
Idioms
2.
play hob with, to do mischief or harm to:
The child played hob with my radio, and now it won’t work at all.
3.
raise hob, to cause a destructive commotion; behave disruptively:
They raised such hob with their antagonistic questions that the meeting broke up.
/hɒb/
noun
1.
(Brit) the flat top part of a cooking stove, or a separate flat surface, containing hotplates or burners
2.
a shelf beside an open fire, for keeping kettles, etc, hot
3.
a steel pattern used in forming a mould or die in cold metal
4.
a hard steel rotating cutting tool used in machines for cutting gears
verb hobs, hobbing, hobbed
5.
(transitive) to cut or form with a hob
/hɒb/
noun
1.
a hobgoblin or elf
2.
a male ferret
3.
(US, informal) raise hob, play hob, to cause mischief or disturbance
n.

“side of fireplace,” 1670s, alteration of hubbe (1510s), of unknown origin, perhaps somehow related to the first element in hobnail.
n.

“clown, prankster,” short for hobgoblin (q.v.). Hence, to play (the) hob “make mischief” (by 1834).