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English definition of “razor-sharp”

razor-sharp

adjective uk   /ˌreɪ.zəˈʃɑːp/ us    /-zɚˈʃɑːrp/

razor-sharp adjective (SHARP)

extremely sharp: These animals have razor-sharp teeth.

razor-sharp adjective (CLEVER)

If you describe someone or someone's mind as razor-sharp, you mean that that person thinks very clearly and quickly: She's got a razor-sharp mind.
(Definition of razor-sharp from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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