early 15c., "to mix with alternate layers of fat" (before cooking), from Old French entrelarder (12c.), from entre- "between" (see inter-) + larder "to lard," from Old French lard "bacon fat" (see lard (n.)). Figurative sense of "diversify with something intermixed" first recorded 1560s. Related: Interlarded; interlarding; interlardment.
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