Etymology
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thumbtack (n.)

tack with a broad, flat head which may be driven by pressure from the thumb, 1884, from thumb (n.) + tack (n.1).

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Definitions of thumbtack
1
thumbtack (v.)
fasten with thumbtacks;
The teacher thumbtacked the notice on the bulletin board
2
thumbtack (n.)
a tack for attaching papers to a bulletin board or drawing board;
Synonyms: drawing pin / pushpin
From wordnet.princeton.edu