Sentence:  II Scarsely had Phoebus in the glooming East 10 Yet harnessed his firie-footed teeme, Ne reard above the earth his flaming creast; When the last deadly smoke aloft did steeme That signe of last <WSD>outbreathed</WSD> life did seeme Unto the watchman on the castle wall, 15 Who thereby dead that balefull Beast did deeme, And to his Lord and Ladie lowd gan call, To tell how he had seene the Dragons fatall fall. 
Meaning of the word marked with <WSD> tags:  To breathe out; expire.