what's the meaning of "made his remarks ... concrete"
He never made his remarks on the relation between biopolitics and liberalism concrete. (source)
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To make a thought or concept concrete means to be specific and exact, and usually to include "concrete examples" -- examples that leave no question as to the specificity of the idea.
This is related to "solidifying" an idea (concrete is an example of a solid object, thus the metaphor): taking it from an ethereal concept and bringing it closer to reality by avoiding generic, lofty language and instead providing exact details and contingencies.