/ ˌklɔːstrəˈfəʊbiə; NAmE -ˈfoʊ-/ noun
[ U ] an extreme fear of being in a small confined place; the unpleasant feeling that a person gets in a situation which restricts them :
to suffer from claustrophobia
She felt she had to escape from the claustrophobia of family life.
—compare agoraphobia
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WORD ORIGIN
late 19th cent.: modern Latin , from Latin claustrum lock, bolt + -phobia (see phobia ).