noun
mouth and ear
Literal compound meaning 'mouth and ear'. Often used in set phrases like 口耳の学 (superficial learning heard but not truly understood) or 口耳の間 (between mouth and ear, i.e., fleeting or shallow).
口耳の学に過ぎない知識では、本当の理解にはならない。
Knowledge that is nothing more than superficial learning from mouth to ear does not lead to true understanding.