How to eat like a horse
A 1,200-pound horse eats about seven times it's own weight each year.

More facts about idioms.
A 1,200-pound horse eats about seven times it's own weight each year.
The phrase "rule of thumb" is derived from an old English law which stated that you couldn't beat your wife with anything wider than your thumb.
Clans of long ago that wanted to get rid of their unwanted people without killing them used to burn their houses down - hence the expression "to get fired."