It isn't an "idiom"; it's poetry, in "Song of Myself, 43" by Walt Whitman - 1819-1892. Words of poems don't have to have a literal, everyday meaning. The preceding lines and words introduce various ideas to do with rotation, so 'turn' is appropriate.
Looking forth on pavement and land, or outside of pavement and land,
Belonging to the winders of ...
My first post on this site. I’m not a linguist, but I’m interested in linguistics.
The terms in question do not have the same meaning.
They are all common terms used in the Sports vernacular.
Top Dog refers to a competitor or team that has achieved dominance in a particular area, like the New York Yankees in a good year.
Dark Horse is usually used to ...