Definition of sink into phrasal verb from the Oxford Advanced Learner's Dictionary

 

sink into

 phrasal verb
phrasal verb
 
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Phrasal Verbs
to go gradually into a less active, happy or pleasant state She sank into a deep sleep. He sank deeper into depression.

sink into something

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sink something into something

 
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to go, or to make something sharp go, deep into something solid The dog sank its teeth into my leg (= bit it). I felt her nails sink into my wrist.

sink something into something

 
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to spend a lot of money on a business or an activity, for example in order to make money from it in the future We sank all our savings into the venture.
See the Oxford Advanced American Dictionary entry: sink into