We've had a very successful year, and I think we have a right to 'blow our own horn' [=('Brit') 'blow our own trumpet'] a little.
When he heard there was trouble, he 'got on the horn' to the police. [=he phoned the police]
The bad economic news has caused many investors to 'pull in their horns'.
(..) The monk's hand points to the Bible, in which is written: "And I saw a woman sit upon a scarlet colored beast, full of names of blasphemy having seven heads and ten horns. And the woman was arrayed in purple and scarlet color, having a golden cup in her hand. And upon her forehad was a name, (..)1927 Metropolis