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KICKAPOOS
A tribe of Indians which formerly busy the region of Northern Illinois, allied in language to the Sacs and Foxes. Kickback. N. Recoil, of a gun or car, as in older automobile engines when started by turning a crank. 2. A mystery, and generally illegal, payment, by a recipient of money paid for goods or services, to a facilitator of the transaction, of a portion of that money.
Source: Websters Vocabulary