【句子】

Our relationship is falling apart at the seams.
我们的关系破裂了。

【解析】

at the seams 的同义词是entirely ,completely.用来修饰fall apart（崩溃，瓦解，破裂，破碎）这个动作。

fall apart at the seams可认为成一个固定搭配，fall apart at the seams 破裂，失败，崩溃  

【引申】

burst at the seams  在焊缝处裂开，引申为：过满，过于拥挤

①I ate so much I thought I'd burst at the seams.
我吃了这么多，我想我吃得过饱了。

②Even then the boilers often burst or came apart at the seams.
甚至那时的锅炉也经常从焊接处爆炸或裂开。

③There were so many people that the hall was bursting at the seams.
人多极了，会堂挤得水泄不通。