When it comes to finding synonyms for the phrase "tub-thump," there are a number of different options to choose from. Some of the most commonly used alternatives include words like "bluster," "rant," "lecture," "harangue," "preach," "pontificate," and "dogmatize." These terms all convey a sense of forceful and impassioned speech or argumentation, often accompanied by a strong physical presence or repetitive gestures. Whether you are looking for a more formal or informal way to express yourself, there are plenty of different options available to help you communicate your ideas in a powerful and effective way.