thumbtack
nounUK /ˈθʌm.tæk/
US /ˈθʌm.tæk/
A small pin with a flat top that you push into a board with your thumb.
She used a thumbtack to hang the picture on the wall.
SYNONYMS
OTHER MEANINGS
2. A short nail with a broad flat head, used for fastening.
He hammered a thumbtack into the wooden crate.
3. To fasten or attach something with a thumbtack.
Please thumbtack the memo to the board.
4. A small pointed object used to mark a spot on a map.
She placed a thumbtack on the city where she was born.