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Longman Dictionary of Contemporary English
concentration camp
noun
EXAMPLES FROM CORPUS
▪ Alexander Schweidler, 78, a former concentration camp guard who settled in Britain, died after a heart attack.
▪ April 18: Had that lousy dream about packing up for the concentration camp and the clock going dead.
▪ In 1944 the woman was betrayed and imprisoned in a concentration camp.
▪ What really struck me was that I looked like a concentration camp prisoner.
▪ You look as if you've been in a concentration camp you do! and that's the truth.
Douglas Harper's Etymology Dictionary
concentration camp

1901, "compound for noncombatants in a war zone" (see concentration); a term for a controversial idea in the second Boer War (1899-1902), and the term emerged with a bad odor.\n\nThe concentration camp now definitely taken its place side by side with Black Hole of Calcutta as one of those of horror at which humanity will never cease shudder.

["The Review of Reviews," London, March 1902]

\nIt also was used 1902 in reference to then-current U.S. policies in the Philippines, and retroactively in reference to Spanish policies in Cuba during the insurrection there of 1896-98. The phrase was used in U.S. during the Spanish-American war, but in reference to designated rendezvous points for U.S. troops headed overseas. In reference to prisons for dissidents and minorities in Nazi Germany from 1934, in Soviet Russia from 1935.
Wiktionary
concentration camp

n. 1 A camp where large numbers of persons—such as political prisoner, prisoner of war, refugee—are detained for the purpose of concentrating them in one place. 2 A camp or premises in which persons considered to be undesirable by those who control it are hidden away, mistreated, and even killed. 3 A situation wherein crowding and extremely harsh conditions take place.

WordNet
concentration camp
  1. n. a penal camp where political prisoners or prisoners of war are confined (usually under harsh conditions) [syn: stockade]

  2. a situation characterized by crowding and extremely harsh conditions

Usage examples of "concentration camp".

I mean of course I'm relieved, anyone would be, this place has been like a concentration camp since Saturday, but what happens next?