The phrase "steam open" refers to the act of using steam to open a sealed container or object. Synonyms for this action include "unseal," "unlock," "crack," "break," and "unfasten." Other potential synonyms for "steam open" might include "dislodge," "unglue," "unscrew," and "unhinge." The specific synonym used may depend on the context in which the phrase is being used, as well as the object or container being opened. For example, "unseal" may be a more appropriate synonym for opening a jar of pickles, while "unlock" may be a better fit for opening a locked box with steam.