The phrase "expose to" can be substituted with a variety of synonyms depending on the context. In terms of introducing someone to a new experience or idea, the phrase "introduce to" could be used. For describing the act of presenting information or evidence, "reveal" or "disclose" may be appropriate. To describe the act of subjecting someone or something to an unpleasant situation, "subject to" or "confront with" may be fitting. Additionally, "touch on" or "broach" could be used when lightly mentioning a topic or idea without delving into it too deeply. Overall, there are many different words that can be used to convey the idea of "expose to" depending on the situation.