The phrase "to beat that drum" means to continuously talk about something or express a strong opinion in order to make it known or convince others of its importance. Full definition
As long as educators and their constituents see an imperfect system that cries out for improvements, school reformers will be at the front ranks beating a drum for changes. (asumag.com)
Everywhere you go, it seems legal tech experts beat the drum of going paperless and the overwhelming advantages of paperless offices. (lawyerist.com)
The union has been beating the drum on this one for some time, with a statewide radio ad campaign that launched today and a companion print ad scheduled to appear tomorrow. (nystateofpolitics.com)