The two priests went back to the garden, and Phut was in solitude.

And our escape, which had offered a most excellent chance of success, went "phut" accordingly.

Looks like this ol' sausage was punctured bad, an' I'm gettin' to think she's goin' to phut out quick an' go down wallop.

The engine kept on with its rapid "phut, phut, phut" steadily, but the air-ship was sinking much more rapidly than it should.