There are various expressions that can be used as synonyms for the phrase "be lost to view." Some examples include "disappear from sight," "vanish from sight," "fade into oblivion," "become invisible," "go out of sight," "slip from sight," or simply "disappear." All of these phrases convey the idea of something or someone being out of sight and no longer visible. They are often used to describe objects that are obscured by distance, darkness, or obstacles, but can also refer to abstract concepts such as memories or ideas that have been forgotten or lost over time.