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acquit (v.)[acquit 词源字典]: early 13c., "to satisfy a debt" (either for oneself or on behalf of another), from Old French aquiter "pay, pay up, settle a claim" (12c.), from a "to" (see ad-) + quite "free, clear" (see quit (adj.)). Meanings "set free from charges" and "to discharge one's duty" both recorded from late 14c. Related: Acquitted; acquitting.[acquit etymology, acquit origin, 英语词源]
pay (v.): c. 1200, "to appease, pacify, satisfy," from Old French paier "to pay, pay up" (12c., Modern French payer), from Latin pacare "to please, pacify, satisfy" (in Medieval Latin especially "satisfy a creditor"), literally "make peaceful," from pax (genitive pacis) "peace" (see peace). Meaning "to give what is due for goods or services" arose in Medieval Latin and was attested in English by early 13c.; sense of "please, pacify" died out in English by 1500. Sense of "suffer, endure" (a punishment, etc.) is first recorded late 14c. Related: Paid; paying.
requite (v.): c. 1400, "repay" (for good or ill), from re- "back" + Middle English quite "clear, pay up," earlier variant of quit (see quit). Related: Requited; requiting.