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thumbtack

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thumbtack/ˈθʌmˌtæk/noun
pluralthumbtacks
thumbtack
/ˈθʌmˌtæk/
noun
pluralthumbtacks
Learner's definition of THUMBTACK  
[count]US
: a short pin that has a large, flat head and that is used to attach papers, pictures, etc., to a wall or bulletin board
— see picture at office
— called also "British"drawing pin
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