1
general::
Phrase(s): drum something out
to beat a rhythm, loudly and clearly, as if teaching it to someone. • Drum the rhythm out before you try to sing this song. • Drum out the rhythm first., Phrase(s): drum someone out
Go to drum someone out of something and drum someone out
McGrawhill's American Idioms And Phrasal Verbs
2
general::
Expel or dismiss publicly and in disgrace, as in They drummed him out of the club. This usage, which alludes to dismissal from a military service to the beat of a drum, began to be applied to civilian expulsions in the mid-1700s.
American Heritage Idioms