The word "叛逆" is formed by combining the character "叛", meaning to betray or rebel, which itself is composed of "半" (half) and "反" (against), implying a split or opposition, with the character "逆", meaning to disobey or go against, composed of "辶" (movement) and "屰" (contrary), indicating contrary movement; together, they reinforce the concept of rebellion or defiance through their shared notions of opposition.