1
(something) not coming together (as one had hoped or expected);unfortunate turn of events;unexpected turn;(a) crossbill's beak (which has differently shaped upper and lower parts)
often as 〜の食い違い (with the same meaning)
See also:
交喙 (イスカ)
Other forms
交喙の嘴 【いすかのはし】 · 鶍の嘴 【いすかのはし】