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Từ điển Oxford Advanced Learner 8th
drawing pin
ˈdrawing pin [drawing pin drawing pins] BrE NAmE (BrE) (NAmE thumb·tack, tack) noun 
a short pin with a large round flat head, used especially for fastening paper to a board or wall
See also: ↑tack ▪ ↑thumbtack
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