inform(на кого-либо • He was a pariah. He had informed on two other cops who engaged in police brutality. And it had cost him his livelihood.4uzhoj); blow upon; delate; rat; fink; inform against(кому-либо, на кого-либо); inform on(кому-либо, на кого-либо); get over; rat on; get something across to(объяснить triumfov); finish carrying; wear out; waft; nark; put the finger on(на кого-либо); put something across(triumfov); only to wear; grass(на кого-либо); get across(мысль и т.п. до кого-либо • That is a message that has to be got across to people without scaring the living daylights out of them," he said. // тж. send across, put across4uzhoj); get through(The really clear message I want to get through is this is not about this season – by Spencer Callaghan Tamerlane); grass up(на кого-либо; to report someone to a person in authority matchin); communicate(So I decided to take action and learn it so that I can redesign my bathroom and also communicate this idea to the tradesmen clearly.4uzhoj)
blow the whistle(on someone – на кого-либо) не несет негативной окраски и употребляется в нейтральном контексте в официальной лексике английского языка)