listen upmainly US informal
— phrasal verb with listen uk /ˈlɪs.ən/ us /ˈlɪs.ən/ verb [ I ]
(Definition of “listen up” 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.