verb
to be fully understood or realized after a period of time
adverb
used to describe the manner in which something is fully understood or realized
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It took some time for the gravity of the situation to sink in.
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I had to hear the news a few times for it to really sink in.
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When she finally realized what had happened, it really started to sink in.
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The meaning of the poem didn't sink in until I read it a second time.