dwindle
To slowly become smaller, weaker, or less over time.
When something dwindles, it gradually becomes smaller, weaker, or less until almost nothing remains. Your enthusiasm for a boring chore might dwindle as you realize how long it will take. A pile of Halloween candy dwindles day by day as you eat piece after piece. A crowd at a park might dwindle as families head home for dinner.
The word captures that slow, steady shrinking over time. It's different from something disappearing suddenly or being used up all at once. Savings dwindle when you keep making small purchases. A flashlight's battery power dwindles the longer you leave it on. Interest in a fad dwindles as people move on to the next thing.
Dwindling often happens so gradually you barely notice at first. A student's focus might dwindle during a long lecture. Resources can dwindle if not managed carefully. The word usually suggests something unfortunate: you rarely hear about problems or annoyances dwindling, though of course they can. When your energy dwindles at the end of a long day, you know it's time to rest and recharge.