To mark, cover, or treat with chalk.
From the prefix 'be-' combined with 'chalk' (from Old English 'cealc,' from Latin 'calx,' meaning limestone); the verb form means to apply chalk to something.
Teachers have been 'bechalking' blackboards for over a century, but the word itself is almost extinct—it's a forgotten verb that deserves a comeback for describing that specific dusty action.
Complete word intelligence in one call. Free tier — 50 lookups/day.