dwindle
dwindle away
dwindle down

After an hour the waiting line had dwindled away to nothing.

In the space of two or three months my professional life dwindled away to almost nothing.

My small resources were dwindling away, and every week it became more necessary that I should find something to do.

Certainly they must have been able to keep their atmosphere from dwindling away.

After a short while the group dwindled away, until only a single individual remained.

The number on the field dwindled away to half within moments.

His words dwindled away as he found himself pointing at nothing.

But as he looked out from the tower all thought dwindled away.

It dwindled away to my right, the direction our road ran.

Nobody said anything, but the crowd began to dwindle away.