/ · 1894 Brewer’s · I · Interpolate
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For two or more persons to polish up something between them. Metaphorically, to insert spurious matter in a book or document; to gag. (Latin, inter polio, to polish.)
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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.