warble

It rose with a low, clear, deliberate warble, and seemed to float in the gray sky like the note of a lark.

Their subdued warble may be heard during October and later, as if the birds were humming to themselves.

Shrill and re-echoing through the narrow passage came the flute-like warble which Jacob knew only too well.

Petticoat told her that his mother had been living with him, but had fled incontinently on hearing a description of Warble.

The car was a museum piece, and as Warble caromed into its cushions she felt that her lines had fallen in pleasant places.