1. a short pin with a large flat head, used to attach papers to a bulletin board or wall

1. to attach or fasten with a thumbtack

Examples

• She used a thumbtack to hang the poster on her bedroom wall.
• The teacher asked students to thumbtack their artwork to the bulletin board.
• He pressed the thumbtack into the cork board with his thumb.
• The notice was held up by four thumbtacks in each corner.
• Can you thumbtack this memo to the office board?
• The thumbtack fell out and the paper fluttered to the floor.
• She carefully thumbtacked the map to the wall for reference.