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paperknife

noun

🔊/ˈpeɪpənaɪf/

🔊/ˈpeɪpərnaɪf/

(plural paperknives

🔊/ˈpeɪpənaɪvz/

🔊/ˈpeɪpərnaɪvz/

)

(especially British English)

(North American English usually letter opener)

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a knife used for opening envelopes拆信刀；开信刀