hourglass
nounUK /ˈaʊəɡlɑːs/
US /ˈaʊərɡlæs/
A glass tool with sand inside that falls from the top to the bottom to show how much time has passed.
She turned the hourglass over to start timing the game.
OTHER MEANINGS
2. A shape that is narrow in the middle and wide at the top and bottom.
The dress had an hourglass shape.
3. A figure or symbol shaped like an hourglass, often used to mean time.
The old sign showed an hourglass to tell people time was running out.
4. A type of figure or body shape that is curvy at the top and bottom with a small waist.
The costume designer drew an hourglass silhouette.