Dictionary / Vocabulary / 歯抜け
はぬけ
having missing teeth; toothlessness
Also written 歯脱け
ボードが箱に歯抜けで入れられてるから、詰めていれれば、箱がもっと有効につかえるよ。
There are gaps between the boards in the box. If you fit them in snugly, you'll get more use out of the box.