lockup

noun

lock·​up ˈläk-ˌəp 

1

: jail

especially : a local jail where persons are detained prior to court hearing

2

: an act of locking : the state of being locked

Synonyms of lockup

• jail
• prison
• penitentiary

Examples of lockup in a Sentence

the firm conviction that juvenile offenders should never be held in adult lockups

Recent Examples on the Web

Kamlager-Dove’s bill, called the Pregnant Women in Custody Act, would require the federal government to collect data on pregnancies — how many, the treatment, the outcomes — not only in local jails, but also in federal and state lockups, including immigration detention facilities. —Jon Schuppe, NBC news, 7 May 2026

Salinas Valley has become one of the most violent lockups in the state. —Matthew Ormseth, Los Angeles Times, 17 Apr. 2026

Photos capture missing American’s husband in first sighting since lockup. —FOXNews.com, 14 Apr. 2026

Diddy had faced a maximum of 20 years in lockup; the prosecution asked Subramanian for a 135-month sentence. —Victoria Bekiempis, Vulture, 9 Apr. 2026

Word History

First Known Use

1746, in the meaning defined at sense 1

Rhymes for lockup

• backup
• blowup
• breakup
• buildup
• checkup
• cleanup
• holdup
• hookup
• lineup
• makeup
• markup
• pickup

Kids Definition

lockup

noun

lock·​up -ˌəp 

: prison sense 2, jail

Legal Definition

lockup

noun

lock·​up

1

: a cell or group of cells (as in a courthouse) or jail where persons are held prior to a court hearing compare house of correction, house of detention, jail, penitentiary, prison

2

: the tactic of arranging with a friendly party an option to buy a valuable portion of one's corporate assets in order to discourage a takeover by another party