Lead on is a phrasal verb that refers to the act of guiding or directing someone forward or onward. Synonyms for lead on can vary depending on the context and can include terms like guide, direct, show the way, move forward, and advance. Other synonyms that denote a sense of persuasion or encouragement can also be applied to lead on. These might include terms like convince, coax, sway, persuade, and prompt. In a more negative context, synonyms like mislead, deceive, or delude might be used. Ultimately, the choice of synonym will depend on the specific context and the tone and intention behind the speaker's words.