The phrase "(with) your heart in your mouth" is commonly used to describe a feeling of nervousness, fear or excitement. However, there are several other phrases that can be used interchangeably to express the same emotions. Words such as "on tenterhooks", "on edge", "sweating bullets", "breathless", "apprehensive", "fluttering" and "anticipating" all convey the intensity of emotions associated with the phrase "(with) your heart in your mouth". Whether it's waiting for a big moment, being on the brink of something life-changing or simply experiencing a thrilling experience, these alternative phrases express the complex array of emotions one can feel in such moments.