The phrase "gutted it out" is commonly used to describe someone who persevered through a difficult situation with sheer willpower. For those looking to expand their vocabulary, there are several synonyms for this phrase. "Endured" is a word that can be used to describe someone who patiently persevered through a tough situation. "Toughed it out" is another phrase that can be used when someone pushed through despite the odds being against them. "Slogged through" also conveys a similar meaning of pushing through a difficult situation with determination. Regardless of the word used, the sentiment remains the same - perseverance through tough times with strength and determination.