plural thumbtacks
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
called also (British) drawing pin
Cite this Entry
“Thumbtack.” Merriam-Webster.com Simple Definition, Merriam-Webster, https://www.merriam-webster.com/simple/thumbtack. Accessed 15 Apr. 2026.
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