The word "de-signing" refers to the act of removing or canceling a design or plan. Antonyms of the word "de-signing" include "designing" which refers to the act of creating or planning something. Another antonym is "implementing" which means putting a plan into action. "Constructing" is also an antonym as it involves building or creating something according to a specific design or plan. Other antonyms of "de-signing" include "developing", "formulating", "inventing", "establishing", and "producing". The opposite of "de-signing" involves actively creating, planning, building, or implementing a design or plan.