noun. a tack for attaching papers to a bulletin board or drawing board.
- paper fastener
- drawing pin
verb. fasten with thumbtacks.
Example sentences of the word thumbtack
1. Noun, singular or mass
Stick a thumbtack through the end of the yarn and into the wall to hang the record.
2. Verb, base form
To add items on a foam board you may glue, tape or even thumbtack them into place.