dos

Etymology 1

noun

1. plural of do
   With the coming of Monday arrived a new life for David—a curious life full of "don'ts" and "dos." David wondered sometimes why all the pleasant things were "don'ts" and all the unpleasant ones "dos." 1916, Eleanor H. Porter, chapter VIII, in Just David

Etymology 2

noun

1. (music) plural of do
   In functional harmonic progression, three “Dos” in a row within the Do-Ti test indicate chord changes that can only be this descending third pattern. 2020, Jennifer Snodgrass, Teaching Music Theory, Oxford University Press, page 212