The phrase "flake off" typically means to come apart or break away in small pieces, often as a result of erosion, wear and tear or simply by losing its adhesion. Some antonyms to "flake off " could include words such as stick, cling, attach, bond and adhere. These terms imply that something is adhering or sticking together, rather than fracturing or falling apart. Other antonyms could be stay, remain, steadfast, endure and persist, which suggest that something is holding firm, remaining in place or continuing to endure despite external forces that might otherwise cause it to flake off. Overall, the antonyms for "flake off" provide a variety of possible ways to describe the opposite of something that is breaking or loosening its hold.