The phrase "guts it out" often refers to persevering through difficult times or a challenging situation. However, there are several synonyms that could be used in its place. To tough it out, grit one's teeth, soldier on, persevere, endure, or plow through could all be substituted for "guts it out." Each of these phrases conveys the same spirit of determination and willpower as "guts it out." Choosing a synonym that resonates with an individual's style and tone can help add depth and emotion to their writing or speech while conveying the same underlying message.