substance abusenoun [ U ]uk /ˈsʌb.stəns əˌbjuːs/ us /ˈsʌb.stəns əˌbjuːs/ formal
noun [ C ] uk us
(Definition of “substance abuse” 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.