Sentence:  ... If I do prove her haggard, / Though that her <WSD>jesses</WSD> were my dear heartstrings, / I'ld whistle her off and let her down the wind, / To pray at fortune. 
Meaning of the word marked with <WSD> tags:  A short strap fastened around the leg of a bird used in falconry, to which a leash may be fastened.