You Can’t Sweat Like a Pig
If pigs can’t sweat, why say “sweat like a pig”?
The phrase comes from the iron smelting process. Hot iron is poured on the sand and cools and solidifies. The pieces look like a sow and piglets. Hence “pig iron”.
When the iron cools, the surrounding air reaches its dew point, and beads of moisture form on the surface of the “pigs.”
So, sweating like a pig really means that the pig iron has cooled enough to be safely handled.
And no, that pig is not edible.
Pigs are born without sweat glands. When they do need to cool off, they enjoy a roll in a mud puddle.