The phrase "fall short of" refers to the act of failing to meet a certain standard or expectation. Some synonyms for this phrase include "come up short," "fail to achieve," "miss the mark," "be deficient," and "lack." Other phrases that imply the same meaning include "not measure up," "underperform," and "fall behind." When you use different synonyms, it can help to add depth and variety to your work. By broadening your vocabulary, you can more effectively communicate your thoughts and ideas, both in formal and informal settings.