shell shock
US /ˈʃel ˌʃɑːk/
UK /ˈʃel ˌʃɑːk/
1.
a psychological condition caused by prolonged exposure to active warfare, especially bombardment, characterized by anxiety, depression, and impaired functioning.
:
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Many soldiers returned from the war suffering from shell shock.
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The veteran's nightmares were a lingering effect of his shell shock.