"Be spangled" refers to adding small sparkly or shiny objects to a surface, which means antonyms for this term would involve removing or dulling that surface. Some antonyms could include words like "scrape," "abrade," "scratch," "erase," "smudge," "smear," "dirty," "smut," "deface," "mar," or "blemish." These words refer to actions that would either erase or add smudges or marks to the surface, thereby removing the sparkly, decorative elements of being spangled. These antonyms could also apply to more specific contexts where the surface has already been spangled or decorated, and there is a desire to revert it back to its original form.