number onenoun [ U ]uk /ˌnʌm.bə ˈwʌn/ us /ˌnʌm.bɚ ˈwʌn/
number one noun [ U ] (YOURSELF)
number one noun [ U ] (THE BEST)
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(Definition of “number one” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)
(Definition of “number one” from the Cambridge Academic Content Dictionary © 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.