Glom onto is an idiomatic expression that means to grab or cling onto something or someone tightly. Its antonyms are to let go, release, loosen your grip, or detach. Other terms that can convey opposite meanings of glom onto include disengage, dislodge, relinquish, give up, or abandon. These antonyms are applicable in different contexts where we need to express the opposite of "glom onto," such as in relationships, work, or personal habits. For instance, to stop being clingy to someone, you may need to "let go" of them, while to release a stuck object, you may need to "disengage" or "dismantle" it.