"Knocked chip off one's shoulder" means to remove someone's attitude of defensiveness or provocation. Some synonyms for this phrase are "calmed down", "soothed", "pacified", "appeased", and "assuaged". These words all suggest that the person's hostile or defensive posture has been diffused or neutralized in some way. Other possible synonyms include "disarmed", "unburdened", "relieved", "reassured", and "comforted". In each case, the implication is that some previous tension or conflict has been resolved, whether through explicit communication or through a change in the person's emotional state.