keep somebody in phrasal verbphr v a) to make someone stay in hospital because they are too ill to go home 让〔某人〕留院 They kept her in overnight for observation. 他们让她留院观察一夜。
b) KEEP somebody IN A PLACE British EnglishBrE to force someone to stay inside, especially as a punishment in school 使〔某人〕留在屋里;〔尤指〕罚〔某人〕课后留校
→ keep somebody in at keep1(PHRASAL VERB)