sich [+Dat] etw. hinter die Ohren schreiben
Phrase: to be sure to remember sth.
This idiomatic expression literally translates to ‘writing something behind your ears’. Apparently, ancestors used to call their children as witnesses to important events and cuffed/patted them on the back of the ears so that they could remember the event better and pass on the knowledge to later generations.
Ich habe dir schon tausendmal gesagt, dass du mich vorher fragen sollst, bevor du an meine Kunstsammlung gehst. Schreib dir das endlich hinter die Ohren! = I’ve already told you a thousand times to ask me before you approach my art collection. Be sure to remember this!/Get this into your head!
Bunny ears. Photo: stux via Pixabay