Drum into
Definition 1 of 1
Pro Tip 1/3Repetition Emphasis
The phrase implies heavy repetition, similar to how a drumbeat is consistent and persistent. 
The coach drummed the strategies into the players until they could execute them perfectly.
Pro Tip 2/3Authoritative Tone
'Drum into' often suggests an authority figure is doing the teaching. 
The sergeant drummed the importance of discipline into the new recruits.
Pro Tip 3/3Mild Frustration
It might imply mild frustration at the need for such repetition. 
I have to drum into him the importance of being punctual for our meetings.