The word that provides the best context clue to the meaning of churning is turning.
Answer:
In Thomas' poem, the lines "Do not go gentle into that good night" and "Rage, rage against the dying of the light" are refrains. In villanelles, the refrain comprises the last lines of the poem.Thomas uses a villanelle because villanelles often dealt with pastoral, natural, or simple themes.
Explanation:
Yes there is. But if you want more specific then can you explain more clearer please and thanks :p