n. A small nail-like tack with a slightly rounded head that can be pressed into place with light pressure from the thumb; used for hanging light articles on a wall or noticeboard
v. To fix or attach something with a thumbtack.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
v. fasten with thumbtacks
n. a tack for attaching papers to a bulletin board or drawing board
Word Usage
"On a thumbtack was a church calendar with a huge picture of Jesus Christ, his hair brown ringlets against a cerulean-blue background, and his eyes heavenward."