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Regarding; with respect to; referring to. From the French à propos, meaning "to purpose." Apropos of the decision reached at this morning's board meeting, I think we should move ahead with the staff reduction directly. And then he just punched Jeremy in the face, apropos of nothing!
apropos of nothing
Of an action or something said, for no reason or with no relation to the immediate conversation, as of a non-sequitur. We were talking about our weekend plans when Ed asked, apropos of nothing, if we could show him how to sew a button.
Concerning, in connection with, as in Apropos of keeping in touch, I haven't heard from her in months. This idiom was a borrowing of the French à propos de ("to the purpose of") in the 17th century. At first it was used without of and meant "fitting" or "opportune," as in Their prompt arrival was very appropos. By the 1700s it was also being used with of, as in the current idiom, for "concerning" or "by way of."