I’ve noticed this phrase a lot online recently. I haven’t heard it much in real life, with it being an American-English term, but it certainly seems to have cropped up a lot lately.
If you’re not familiar with it, it means to accept that you’ve been wrong or beaten, particularly if you’ve made an embarrassing error. The phrase was first recorded in the 1870s in the United States as to eat boiled crow, presumably because crow (presumably) doesn’t taste so pleasant.
It’s interesting to look at other similar phrases: to eat humble pie, to eat your words, to eat your hat. Why all the eating? I think it might be related to taking a remark back. Often when we use the phrases when someone has said something to regret. So when they have to atone for their error they have to reverse the action. Rather than opening your mouth and letting words out, you’re putting words back in. Or substitutes for words, like crows, or humble pies.
I still think there’s more to using crows in this phrase than their not tasting nice though. There are plenty of other things that probably don’t taste nice. Mice. Badgers. Bats. Eating bat: I think that could take off.
English-Language Thoughts 
I spotted that phrase in the Green Day track “Hitchin’ A Ride” too.
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Interesting phrase! There is a lot of mythology associated with crows. Crows are a symbol of death. Even a group of crows is called a “murder”. Not a “flock” or a “swarm” but a murder, haha! So eating them seems darker and more sinister than we might imagine…
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I’ve a funny feeling that it was an actual punishment at some point and this is where the expression comes from.
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I would not be surprised! I was thinking of “Four and twenty blackbirds baked into a pie”. But I have already researched this and found out that the blackbirds were not actually baked… (lucky for those Medieval diners!) But some kind of punishment sounds believable 🙂
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Wikipedia says:
“Literally eating a crow is traditionally seen as being distasteful; the crow is one of the birds listed in Leviticus chapter 11 as being unfit for eating. Scavenging carrion eaters have a long association with the battlefield, “They left the corpses behind for the raven, never was there greater slaughter in this island,” says the Anglo-Saxon Chronicle. Along with buzzards, rats, and other carrion-eating scavenging animals, there is a tradition in Western culture going back to at least the Middle Ages of seeing them as distasteful (even illegal at times) to eat, and thus naturally humiliating if forced to consume against one’s will.”
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Makes sense, we’ve always associated them with death, particularly untimely death.
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