become smaller or lose substance;
"Her savings dwindled down"
- Their vast fortune has dwindled away.
- The snowstorm caused traffic to fall away sharply.
- As he stared at it, his hopes gradually began to ebb away until they had almost vanished.
- Over millennia the Amu's course has drifted away from the sea, causing it to shrink.But the lake always rebounded as the Amu shifted back again.