"I'm not sure that I'm happy that concrete is used as a sort of metonym for anything definite and fixed; there are lots of other hard substances, too, like diamond, steel, or topaz."

"Concrete spends part of its life as a fluid."

"Oh, so it is actually especially good as a verb, concretize or to make concrete, because you're 'hardening' something that previously was not. Thanks!"

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