Etymology
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intermingle (v.)

late 15c. (trans.), from inter- "between" + mingle (v.). Intransitive sense from 1620s. Related: Intermingled; intermingling.

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interblend (v.)

"intermingle," 1823, from inter- + blend (v.). Related: Interblended; interblending.

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interfere (v.)

formerly also enterfere, mid-15c., enterferen, "intermingle or mix (different things), interpose," also "to interfere," from Old French enterferer "exchange blows, strike each other," from entre- "between" (see entre-) + ferir "to strike," from Latin ferire "to knock, strike," related to Latin forare "to bore, pierce" (from PIE root *bhorh- "hole"). Compare punch (v.), which has both the senses "to hit" and "to make a hole in").

Figurative sense of "to meddle with, oppose unrightfully" is from 1630s. Related: Interfered; interfering. Modern French interférer is from English.

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