Verb sink in has 2 senses
  1. click, get through, dawn, come home, get across, sink in, penetrate, fall into place - become clear or enter one's consciousness or emotions; "It dawned on him that she had betrayed him"; "she was penetrated with sorrow"
    Sample sentence:
    Something ----s
  2. percolate, sink in, permeate, filter - pass through; "Water permeates sand easily"
    --2 is one way to penetrate, perforate
    Sample sentences:
    Something ----s
    Something is ----ing PP
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