be on the rocks
a relationship or business that is on the rocks is having a lot of problems and is likely to fail soon SYN in trouble

[TahlilGaran] Dictionary of Contemporary English ▲

on the rocks
1.
likely to fail because of serious problems.
At the time, it seemed like capitalism was on the rocks.

It became clear that her 15-year marriage to David was on the rocks.

Usage notes: most often refers to relationships between people or organizations, as in the examples
2.
with ice.
I'll have a whiskey and soda on the rocks.

Usage notes: used only to refer to alcoholic drinks

[TahlilGaran] English Idioms Dictionary ▲

on the rocks
1. a relationship or a marriage that is experiencing problems
They are experiencing many problems at the moment and their relationship appears to be on the rocks.

2. to be breaking up (a relationship), to be ruined
He has been married for seven years but his relationship is now on the rocks.

[TahlilGaran] English Idioms Dictionary ▲

on the rocks
adj. phr.
1. informal Wrecked or ruined.
Mr. Jones' business and marriage were both on the rocks.
2. With ice only.
At the restaurant, Sally ordered orange juice on the rocks.

[TahlilGaran] English Idioms Dictionary ▲