1894 Brewer’s / F / Fall In (To)
To take one’s place with others; to concur with, as “he fell in with my views”—that is, his views or ideas fell into the lot of my views or ideas. (See Fall Out.)
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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.