keep [sth] hiddenvtr phrasal sepphrasal verb, transitive, separable: Verb with adverb(s) or preposition(s), having special meaning, divisible--for example, "call off" [=cancel], "call the game off," "call off the game."
(conceal)
隐瞒 yǐn mán
Sara kept her diary hidden so that her little sister wouldn't read it.