hold out on someone
phrasal verb with hold verb uk/həʊld/ us/hoʊld/ held | held
informal拒绝帮助（某人）；向（某人）隐瞒情况
to refuse to give help or information to someone
Don't hold out on me - I need to know who did it. 别瞒着我——我需要知道是谁做的。
mainly US informal拒绝给（某人）钱
to refuse to give money to someone