The fog was a living, breathing entity.
Meaning: This sentence is describing how the fog seemed to be alive, as if it had a consciousness and was capable of independent action.
Choice of Words: Living is an adjective that means having life. Breathing is a verb that refers to the process of taking in and releasing air. Entity is a noun that refers to a thing with distinct and independent existence. When you put them together, the phrase "Living, breathing entity" creates a sense of the fog's sentience and vitality.
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