The term 'milling around' or 'milling about' meaning to move (as in a crowd or substantial group of people) aimlessly within a confined or defined area, with no especial purpose discernible, comes from the sight of grain passing through a hopper to the grinding stone below.
The grain is poured into the hopper, where it is moved slowly about in some way to make it fall down into the millstones or grinding mechanism.
Watching the grains 'mill about' can be almost hypnotic.
Milling, as to keep moving round in a mass, 1874 (implied in milling), originally of cattle, from resemblance to the circular action of an animal driven mill wheel.
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Andy Maio invent this phrase in the early 70s
Moving about randomly without apparent purpose.
From a Laurel & Hardy movie.
fROM DA TOIleT
Cowboys loved a colorful phrase! This meant fighting. The image is of cowboys flailing around like windmills.
it means wandering around.
latin
The Bible
from joey in friends
stop
1820-30
from girls ...to hissy...
in concord and lexington.
facebook entry
Andy Maio invent this phrase in the early 70s
Horizontal and vertical milling machine.