freeze in memory
freeze (someone or something) in (someone's) memory
To maintain someone or something in one's memory. I could never forget what it felt like to hold my baby for the first time—I froze that moment in my memory.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
freeze someone or something in one's memory
Fig. to preserve the image of someone or something in one's memory. I tried to freeze her in my memory so I would have her with me always. I froze the scene in my memory.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.