sink in

US /sɪŋk ɪn/
UK /sɪŋk ɪn/
"sink in" picture
1.

to be fully understood or realized

:
It took a while for the news to really sink in.
Let what I said sink in before you respond.
2.

to move downwards into a surface or substance

:
The heavy rain caused the water to sink in quickly.
The mud was so soft that my boots started to sink in.