The phrase "by blows" generally refers to an incidental or accidental hit during a physical altercation. Some synonyms for this term include "glancing blow," "grazing hit," or "stray punch." These words all describe the same general action but with slightly different connotations. A "glancing blow" suggests that the hit was not very forceful or impactful, while a "grazing hit" implies that it barely made contact. Meanwhile, a "stray punch" suggests that the hit was unintentional or unexpected. Regardless of which synonym is used, the concept of a by blow is one that describes an unintended hit that occurs during a physical altercation.