The phrase "hear hear" is commonly used to express agreement or approval. However, there are several other synonyms that can be used to convey a similar sentiment. For instance, one could say "I concur" or "I agree wholeheartedly." Alternatively, someone could say "Well said" or "You hit the nail on the head." Another option is to say "Absolutely" or "Indeed." Additionally, one could use a simple "yes" or even a "bravo" to show support. Ultimately, there are many different ways to express agreement or approval, so it's important to choose the one that best fits the situation and your personal style.