There are many different synonyms for the phrase "hammering on." Some of the most common include "pounding," "beating," "thumping," "drumming," "banging," "rapping," "knocking," and "striking." Each of these words describes a forceful and repetitive action, often with a metallic sound or a sense of urgency. While the phrase "hammering on" can be used in many different contexts, from describing a construction site to characterizing a political campaign, these synonyms can help to add variety and interest to your language. Whether you are a writer, speaker, or just looking for ways to describe the world around you, these words can help.