Mount to is a phrase that refers to the act of adding up to a specific quantity, particularly in terms of numbers or money. There are several synonyms for the word mount to, including sum up, add up, tally, total, accumulate, and accrue. These words are often used interchangeably, depending on the context in which they are used. For example, if you are tracking your expenses, you may say that your expenses are mounting up or that they are adding up quickly. Similarly, if you are trying to calculate your total income, you may say that your earnings tally up to a certain amount. Overall, these synonyms make it easier to express the idea of combining or accumulating quantities in different contexts.