The phrase "get bigger" can be replaced with several different synonyms that emphasize growth and expansion. One such word is "enlarge." This refers to the process of making something larger in size or scale. Another synonym is "expand." This word can be used to convey the idea of growth in terms of size, but also in terms of diversity or complexity. Another option is "swell," which suggests a more rapid and dramatic increase. "Grow" is also a common option, as it is a simple and straightforward way to describe the process of getting bigger. Overall, there are many words that can be used to effectively convey the idea of growth and expansion.