Note 420:

susāunu The sough of wind in trees. However, compare susyāhaṭ, "A groan." Turner [1980:619] includes the following illustration, clearly related to the narrative here: "āphai susyāhaṭle mari rahechu teri sītāko dhandā… (lit. 'I am dying of my own groaning, Sītā is your business', as the pine-tree said to Rām.)"