Sentence:  His arm had been giving him some trouble and Rector was not enough of a medical expert to determine whether it had healed improperly or whether Hino was simply <WSD>rebelling</WSD> against the tedious work in the print shop , using the stiffness in his arm as an excuse . 
Meaning of the word marked with <WSD> tags:  take part in a rebellion; renounce a former allegiance