(someone's) relationship on the rocks

Translations
отношения (кого-то) на грани разрыва
Their relationship is on the rocks because they argue all the time.
Их отношения на грани разрыва, потому что они постоянно ссорятся.
Definitions
A phrase used to describe a romantic relationship that is experiencing serious problems or difficulties and is at risk of ending.
Words
relationship

noun
отношение
rock

noun
скала