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Wiktionary
drum up

vb. (context idiomatic English) To generate or encourage; to campaign for.

WordNet
drum up

v. gather; "drum up support" [syn: beat up, rally]

Usage examples of "drum up".

We haven't any great wish to drum up business for the undertakers.

The Perkins probably sped their drum up when they were near Vesta to show everyone how tough they were.

He was so frustrated and frightened that once or twice on the way over here, wheeling the drum up Ninth Avenue from his apartment, he'd found himĀ­.

He was so frustrated and frightened that once or twice on the way over here, wheeling the drum up Ninth Avenue from his apartment, he'd found himself crying.

It would be just like Brom to try to drum up popular support for the Queen in just this way - but why the propaganda for a march on the castle?