The phrase "more shackling" refers to something restrictive or burdensome. Some synonyms for this phrase include "more suffocating," "more confining," "more constraining," "more oppressing," and "more inhibiting." These words all express the feeling of being held back or limited in some way. Other possible synonyms include "more restraining," "more enslaving," and "more binding." Essentially, any word that conveys the idea of being tied up, held down, or prevented from moving freely could be considered a synonym for "more shackling." Such words could be used to describe various situations, ranging from physical restraints to social or emotional constraints.