There are several synonyms for the phrase "marching the cannon mouth," which means to be so hungry that one's stomach is rumbling loudly. Some alternatives include "growling stomach," "empty stomach," "pangs of hunger," "stomach grumbling," and "hunger pains." These phrases all describe the physical sensation of hunger, accompanied by audible noises from the stomach or gut. Other synonyms might include "starving," "famished," "ravenous," or "voracious," which all convey a stronger sense of hunger or appetite. Whatever the word choice, the feeling of being hungry is a universal experience that most people can relate to at some point in their lives.