Marching to the beat of different drums, the English language offers many more creative ways to say "march cannons mouth." Some synonyms for this phrase include "talk boldly," "speak confidently," "boast," and "brag." Other options using more obscure language could be "bravely pontificate," "swaggeringly orate," or even "proclaim with bravado." When one wants to convey speaking loudly and confidently without the negative connotation of arrogance associated with "march cannon's mouth," synonyms like "state with conviction," "assert," and "declare emphatically," can also be used. These alternative phrases increase the writer's word choice and allow for more interesting variations in vocabulary.