The phrase "squeezed shut" can be replaced by several synonyms that convey the same meaning. Some of the synonyms include "compressed tightly," "crushed tightly," "pinched tightly," "held tightly," and "clenched tightly." These synonyms are all effective ways to describe a situation where something has been closed or tightened firmly. They can be used to describe physical objects or even emotional states, such as when someone's heart feels as though it's being squeezed shut with emotion. When looking to add more variety to your writing, try experimenting with different synonyms for the phrase "squeezed shut" to create more vivid and engaging descriptions.