There are several synonyms for the phrase "opens out" that can be used depending on the context. One is "unfold," which implies a gradual and deliberate opening, often of a physical object like a map or book. Another is "expands," which suggests a more dynamic and sudden opening, like a flower or balloon. "Unfurl" is another option, which can be used to describe unfurling a flag or sail, or opening up a rolled-up carpet or umbrella. "Emerge" is a synonym that suggests something hidden or concealed coming to the surface, while "reveal" implies exposing or bringing to light something that was previously hidden or secret.