The antonyms for the phrase "assume form of" are "lose form," "dissolve," and "disintegrate." These words refer to the opposite of taking on a specific shape or appearance. When something loses its form, it becomes shapeless and formless. Dissolve, on the other hand, refers to the process of a substance becoming mixed and indistinguishable, losing its original form or structure. Disintegrate describes the disassembling or fragmentation of a physical object into smaller parts until it no longer retains its original form. These antonyms remind us that everything around us is in a constant state of change, and nothing stays the same forever, including its form.