Stories We Like: A Guide to the Comma
"freed, exonerated," 1670s, past participle adjective from acquit (v.). Formerly in this sense was acquit (late 14c.), perhaps on analogy of pps. such as hit.
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 à "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.