on the rocks

on the rocks (1. in a state of ruin or destitution;|| 2. with ice) — в тяжёлом положении; на краю гибели; на грани развала; терпеть крушение, полное фиаско; рушиться, разваливаться (о семье, организации и т. п.)

Example 1: After I went to Europe alone, my relationship with Alice was on the rocks.

Example 2: Their marriage was on the rocks.

2. If you have an alcoholic drink on the rocks, you have it with lumps of ice (со льдом).

Example 1: I’ll have a whisky on the rocks, please. (Concise CALD)

Example 2: Would you like your whiskey on the rocks?