out of sight, out of mind
From Longman Dictionary of Contemporary Englishout of sight, out of mindout of mind out of sightout of sight, out of mindFORGETused to say that people soon stop thinking about something or someone if they do not see them for a while → sightExamples from the Corpusout of sight, out of mind• I tucked it in the back of a drawer, figuring out of sight, out of mind.