Sentence:  ... the wary tadpole returned from exile, the bullfrog resumed his ancient song, the tranquil turtle sunned his back upon bank and log and <WSD>drowsed</WSD> his grateful life away as in the old sweet days of yore. 
Meaning of the word marked with <WSD> tags:  To advance drowsily. (Used especially in the phrase "drowse one's way" ⇒ sleepily make one's way.)