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Just to let you know, if it's of any use, you can edit a post and add to it, for something like 10 minutes before the edit period expires. It may help to prevent loads of consecutive posts. Check the little black cog top right of your posts. It gives you options, which expire after 10 minutes or so....
Sometimes, @upekka what seem to be 'profound' questions are really not useful.
Expansion [in]/contraction [out] is a biological happening, there's nothing mysterious about it, and trying to divine some other hidden practice or deeper meaning, is really akin to looking for self/not-self, which is in itself, a pointless exercise.
THAT is also a subject that has been done to death, flogged to within a millimetre of its usefulness....
The saying originated in Britain. Once upon a time, the very poor peasants had to make a meagre living off the land, and hunting, unless for a Lord, Baron or Master, was considered poaching. The only things not off-limits, were rabbits, pigeons and crows, but crows tasted absolutely foul (if you'll pardon the pun) and even to the poor, it was an undesirable food, even if really hungry.
It is also akin to 'eating Humble pie'. The original word was actually Numble (plural: umbles) - which is an archaic word for intestines, innards and distasteful parts of an animal.
Both idioms mean to have to do the unthinkable, retract a statement and admit it was a poor decision, comment or judgement.
There are more idioms connected to foods and eating than anything else.
Walking on eggs,
eat one's words
chew it over
put all one's eggs in one basket
cry over spilt milk
buy a pig in a poke
butter no parsnips
have your cake and eat it
cat that got the cream
food for thought
icing on the cake
apple of one's eye
bun in the oven
bringing home the bacon
earning a crust
and many more, I'm sure.
Yes, I think this has to be one of the very best covers of an original I have ever heard. I came across this quite some time ago, but it never fails to stun....