Crop Up (or) Out
. To rise out of, to appear at the surface. A mining term. Strata which rise to the surface are said to crop out. We also say, such and such a subject crops up from time to time—i.e. rises to the surface; such and such a thing crops out of what you were saying—i.e. is apropos thereof.
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Entry taken from
Dictionary of Phrase and Fable,
edited by the Rev. E. Cobham Brewer, LL.D. and revised in 1895.