It's used metaphorically to describe instability or potential failure in relationships or entities.

Metaphorical Usage

This phrase is often used in negative situations, rarely in positive contexts.

Negative Context

It's casual language, fitting less formal communication like everyday conversation.

Used to specify drinks served over ice, usually strong spirits, not cocktails or soft drinks.

It implies the drink is not mixed or diluted, but ice may slightly chill and dilute it.

The ice can change the taste of the drink as it melts, making the drink smoother.

The phrase can be taken literally to mean physically located on rocky terrain or structures.

It emphasizes ruggedness or the natural aspect of a location.