Meaning of “thumbtack” in the English Dictionary

british dictionary

(Definition of “thumbtack” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"thumbtack" in American English

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thumbtacknoun [ C ]

us /ˈθʌmˌtæk/

a short, sharp pin with a flat, round top that can be pushed into soft wood or other material

(Definition of “thumbtack” from the Cambridge Academic Content Dictionary © Cambridge University Press)