Sentence:  Shakespeare represents the human body under various figures: a "coil:" a "case:" a "frame:" a "machine:" a "vesture:" a "heft:" a "motion" or puppet: &c. It has been contended that in Hamlet's speech, the ‘<WSD>mortal coil</WSD>' is the coil, i.e. trouble of turmoil, incident to man's mortal state: but the analogies are too strong in favor of the ‘<WSD>mortal coil</WSD>' being what Fletcher calls the ‘case of flesh' ("Bonduca", iv. 1). 
Meaning of the word marked with <WSD> tags:  The physical body of man (containing the spirit inside).