Threshing as one of the
39 Melachot would
include all operations where
food is separated
from its natural container, whether
solid and
liquid.
The prime example is threshing grain to remove
it from its husk. But squeezing a fruit for its
juice is included, as well as milking a cow.
<< Prev Full
Next >>
Most of this information is taken
from the book "SABBATH Day of Eternity"
by Rabbi Aryeh Kaplan, published by NCSY.
In the book itself, there are notes that refer the
reader to detailed footnotes.
I am lucky to have found such a clear, concise manual
with these brief overviews of laws so vast and complex
there are Rabbis that specialize in them.