Praise, promote, publicize, as in He's always beating the drum for his division, which actually has done very well. This term transfers the literal striking of a drum for ceremonial or other purposes to touting the virtues of a person, group, or product. [Mid-1900s]
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.