The phrase "most applying" can be interpreted as the action of using something or applying it in the most effective manner. There are several synonyms for this term, including "most suitable," "most relevant," "most appropriate," "most fitting," and "most useful." All these words can be used to convey the idea of the most effective and efficient application of a particular idea, solution or method. Depending on the context, different synonyms for "most applying" can be more appropriate, and choosing the right word can help to improve the clarity and precision of communication.