Greek word
katēchéō
κατηχέω
What it means
to sound down into the ears, i.e. to indoctrinate or to apprise of
to sound down into the ears, i.e. (by implication) to indoctrinate ("catechize") or (genitive case) to apprise of
Where it comes from
from katá (κατά) and ēchos (ἦχος)