Sentence:  For a moment he thought of going into Crosson 's office to explain that he had to leave , but there was now such a pain in his <WSD>chest</WSD> , such a pounding in his head , that he decided to let it go . 
Meaning of the word marked with <WSD> tags:  the part of the human torso between the neck and the diaphragm or the corresponding part in other vertebrates