Locking horns with is a common expression used to describe a confrontational situation wherein two people or groups are at odds with each other. However, there are a variety of synonyms that can effectively communicate the same meaning. Some examples include "butting heads," "clashing," "squaring off," "coming to blows," "opposing," and "resisting." Each of these phrases can be used to convey a sense of tension, opposition, and disagreement. Depending on the context of the situation, certain synonyms may be more appropriate than others. Regardless of the specific phrasing used, these synonyms all capture the combative spirit of locking horns with.