1. (noun)sinking a descent as through liquid (especially through water)
"they still talk about the sinking of the Titanic"
2. (noun)sinking a slow fall or decline (as for lack of strength)
"after several hours of sinking an unexpected rally rescued the market"; "he could not control the sinking of his legs"
3. (noun)sinking, sinking feeling a feeling caused by uneasiness or apprehension "with a sinking heart"; "a sinking feeling in the pit of my stomach"