The phrase "dawning on" can be replaced with a variety of synonyms to convey a similar meaning. "Becoming clear," "registering," "impressing," and "occurring to" all express the gradual realization of an idea or concept. "Sinking in," "hitting home," and "clicking" all imply a sudden understanding or comprehension. Other options include "coming to light," "revealing itself," and "unfolding," which suggest the gradual emergence of a truth or realization. Overall, there are many ways to convey the idea of something gradually or suddenly becoming clear, depending on the context and style of writing.