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Phrase(s): Out of sight, out of mind.
Prov. If you do not see someone or something frequently, you will forget about it. (Sometimes used to imply that you will forget about people who have moved away.) • Ever since I moved, none of my old friends have gotten in touch with me. It’s out of sight, out of mind with them, evidently. • My electric bill somehow got moved to the bottom of the stack on my desk, and I forgot all about paying it. Out of sight, out of mind.
McGrawhill's American Idioms And Phrasal Verbs