Hello, what's the meaning of “for that matter” in this sentence？
Prior to the late 1880s, most of us were so busy trying to make a living that we didn’t care what the Joneses were doing, nor did we know, for that matter.
Hello, ErinD, and welcome to the Grammar Exchange.
You can find a definition of the idiomatic phrase "for that matter" at this online dictionary. In the context of your example, another way of saying "Nor did we know, for that matter" is "We didn't even know."
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