lockdown

[lok-doun] Origin

lock·down

[lok-doun]
noun
1.
the confining of prisoners to their cells, as following a riot or other disturbance.
2.
a security measure taken during an emergency to prevent people from leaving or entering a building: The school remains under lockdown due to police activity in the area.

Origin:
1970–75; lock1 + -down, probably extracted from nouns formed from phrasal verbs, such as crackdown, shutdown, etc.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Lockdown is always a great word to know.
So is interrobang. Does it mean:
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
Collins
World English Dictionary
lockdown (ˈlɒkˌdəʊn)
 
n
(US) a security measure in which those inside a building such as a prison, school, or hospital are required to remain confined in it for a time: many schools remained under lockdown yesterday

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Dictionary.com's 21st Century Lexicon
Main Entry:  lockdown
Part of Speech:  n
Definition:  the state of being grounded and denied privileges
Usage:  slang
Dictionary.com's 21st Century Lexicon
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Etymonline
Word Origin & History

lockdown
from 1940s in various mechanical senses, from lock (1) + down (adv.). Prison sense is by 1975, Amer.Eng.
Online Etymology Dictionary, © 2010 Douglas Harper
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