deaf aidnoun [ C ]uk /ˈdef ˌeɪd/ us /ˈdef ˌeɪd/ UK
› a hearing aid
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(Definition of “deaf aid” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)
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can't hear yourself think
If you cannot hear yourself think, you cannot give your attention to anything because there is so much noise.