Synonyms for the phrase "stammer out" include stutter, falter, stumble, mumble, slur, and hesitate. All of these words convey difficulty in speaking or conveying thoughts, which can be caused by nervousness, anxiety, or physical impediments. Additionally, some alternative phrases that can be used instead of "stammer out" include stumble over words, struggle to articulate, fumble for words, and stutter through a sentence. Each of these phrases captures the essence of someone having trouble with speaking, and can be used in various contexts such as public speaking, social situations, or interviews. Understanding alternative phrases to "stammer out" can improve communication and help individuals to better express themselves.