Dental term referring to the vertical overlap of the upper front teeth over the lower front teeth.
At the dental checkup, I was told I have a deep overbite.
Compound of 上 (うわ, 'upper') + 噛み合わせ (かみあわせ, 'bite, occlusion'). The exact historical derivation is uncertain, but the term transparently describes the meeting of the upper and lower teeth.