The antonyms for the word "trans fixture" can be broken down into two parts. The word "trans" means "across" or "beyond," while the word "fixture" means "an object that is fixed in place." Therefore, the antonyms for "trans" would be "cis," meaning "on this side," or "below," while the antonyms for "fixture" would be "removable," "portable," or "temporary." In summary, the antonyms for "trans fixture" would be "cis removable," "cis portable," "cis temporary," "trans removable," "trans portable," or "trans temporary." These words can be used in different contexts to convey different meanings depending on the situation.