Mounted up is an idiomatic phrase that refers to an increase or accumulation of something. It can be used to describe a wide range of occurrences, from a stack of bills piling up on a desk to the growing excitement or anticipation of an event. Some synonyms for the phrase mounted up include amassed, accumulated, increased, grew higher, rose, multiplied, and stacked up. These synonyms offer a more precise or nuanced description of the original phrase, allowing speakers and writers to more accurately communicate their ideas. By using a variety of synonyms for mounted up, individuals can maintain variety and interest in their language.