The phrase "heels over head" is commonly used to describe a sudden or drastic change in direction or movement, often involving a fall or tumble. Some synonyms for this phrase include "topsy-turvy," "headfirst," "upside down," "flipping," and "somersaulting." Each of these terms suggests a sense of disorientation or losing one's balance, but with varying degrees of intensity or directionality. For example, "topsy-turvy" can refer to a more chaotic or turbulent situation, while "flipping" or "somersaulting" implies a deliberate or controlled movement. Regardless of the exact phrasing, this type of language can add vividness and impact to descriptions of sudden or dramatic actions.