I . ˌsink ˈinto sth
➡ sink in
II . ˈsink into sth
to go gradually into a less active, happy or pleasant state :
She sank into a deep sleep.
He sank deeper into depression.
III . ˌsink ˈinto sth
sink into sth | ˌsink sth ˈinto sth
to go, or to make sth sharp go, deep into sth solid :
The dog sank its teeth into my leg (= bit it) .
I felt her nails sink into my wrist.