Definition of shell shock noun from the Oxford Advanced Learner's Dictionary

 

shell shock

 noun
noun
BrE
 
; NAmE
 
[uncountable] Mental and emotional problems
 
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a mental illness that can affect soldiers who have been in battle for a long time See related entries: Mental and emotional problems Word Origin First World War: with reference to exposure to shellfire.
See the Oxford Advanced American Dictionary entry: shell shock