lock-up (n.)youdaoicibaDictYouDict[lock-up 词源字典]
"detention cell for offenders," 1838, perhaps short for earlier lock-up house; from lock (v.) + up. Meaning "action of locking up" is from 1845. The verbal phrase lock up is recorded from early 15c.[lock-up etymology, lock-up origin, 英语词源]