reserve (v.)youdaoicibaDictYouDict
mid-14c., from Old French reserver "set aside, withhold" (12c.) and directly from Latin reservare "keep back, save up; retain, preserve," from re- "back" (see re-) + servare "to keep, save, preserve, protect" (see observe). Meaning "to book" is from 1935. Related: Reserved; reserving.