- keep one's ear to the ground
- держать ушки на макушке; держать руку на пульсе событий; отслеживать информацию
John had his ear to the ground, hoping to find out about new ideas in computers.
I have a company that deals in arms. In business, we have our ears very close to the ground.
Англо-русский словарь идиом и фразовых глаголов. 2013.