blow the horn

"We must always blow the horn, investigate every case, punish every instance of corruption and resolutely win the hard and protracted battle against corruption," the spokesman said.

“She’s not the type of person,” Blackwell said, “who’s going to blow the horn telling people what she did.”

“In just a few minutes, we’re going to blow the horn and open the gates to the rides in this park for a full sixty seconds! That means you can ride for free, noooo tickets needed, as long as you get on the ride before the horn stops blowing! Once again, this is for every ride in the park!”

I am going to blow the horn of Rohan, and give them all some music they have never heard before.’

After the officials ruled Hellebuyck had kept the puck out of the goal when he swiped out MacDonald’s backhand with his glove at 8:01, play continued for 41 seconds until the NHL replay unit in Toronto phoned to the scoreboard operator to blow the horn.