v.1. To engrave or etch something, such as marks or letters, on a surface by the use of intense heat: I burned in the image of an eagle and then varnished the wood.
2. To darken or brighten a part of a photographic print or negative by exposing unmasked areas: Burn in the edges of the picture to create a darkened border. You can burn in the highlights to enhance their effect.
3. To become a permanently visible image due to constant exposure: The message was displayed on the computer screen so long that it burned in.
4. To implant something firmly in the memory: I repeated the poem over and over again to burn it in my mind. The image of the forest fire has been burned in my memory.