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to be tasty; to be worth eating; to be worth trying
to be able to subsist; to be able to make a living
to be edible
この魚は生では食えない。
This fish can't be eaten raw.
絵を描いて食えるようになりたい。
I want to be able to make a living by painting.
あの店のカレーは思ったより食えた。
The curry at that restaurant was better than I expected.