sink in
phrasal verb with sink verb uk/sɪŋk/ us/sɪŋk/ sank or sunk | sunk
informal
（事实或想法）逐渐被完全理解，被充分意识到
If an unpleasant or surprising fact or idea sinks in, you gradually start to believe it, understand it, or realize the effect it will have on you.
How many times do I have to tell you something before it sinks in? 要我对你说多少遍，你才能明白?
His voice trailed off as the seriousness of his position sank in. 他渐渐明白了自己处境的严峻，话音慢慢低了下来。