quietus
n.
"discharge, clearing of accounts," 1530s, short for Medieval Latin phrase quietus est "he is quit" (see quit). Hence, "death" (i.e. "final discharge"), c.1600. Latin quies also was used for "the peace of death."
〔李〕[quiet;-usn.] n.（债务）清偿；（义务）解脱 ←quies,quiet,quit (L quies,quietus F quitter )= rest 休止