Rupture
Noun and する verb
けつれつ
あの男は奴らの決裂を、牢屋の中で舌なめずりをしながら待っていたに違いない。
That guy must have eagerly waited out their breakdown from behind bars.
The decision is split, causing a breakdown in all we've decided. A big ol' rupture.
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.