Synonyms of 'sink in'
▷ See sink
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His words penetrated her fuddled brain.
If a piece of information does not register or if you do not register it, you do not really pay attention to it, and so you do not remember it or react to it.
What I said sometimes didn't register in her brain.
Thesaurus for sink in from the Collins English Thesaurus
When a statement or fact sinks in , you finally understand or realize it fully .