The word 得逞 is formed by combining the character 得, meaning "to obtain" or "to achieve", with the character 逞, which carries the core idea of "giving free rein to" or "satisfying one's will", often with a negative, unchecked, or brazen quality. Together, they create a compound where 得 acts as a verbal complement, indicating the successful accomplishment of the action implied by 逞. The resulting term conveys the successful execution of a scheme or the fulfillment of a willful, usually illicit or harmful, desire, thus embedding a strong connotation of unwelcome or sinister achievement.