The phrase "lock horns" is used to describe a confrontational situation, typically between two people or groups with differing opinions. When looking for synonyms for this phrase, some options include "clash," "butt heads," "square off," or "go toe-to-toe." These words convey a sense of opposing forces meeting head-on and could be useful in a variety of contexts, from political debates to personal arguments. Other synonyms could include "engage in a battle of wills," "standoff," "confrontation," or "fight for supremacy." Whatever the situation, these synonyms for "lock horns" can help convey the intensity and importance of the disagreement or conflict at hand.