What is the origin of the idiom "leave someone out in the cold" and when to use it?

The idiom "leave someone out in the cold" is believed to have its origins in the harsh realities of winter weather. In cold climates, being left outside without shelter or warmth can be extremely uncomfortable and even life-threatening. This literal scenario of isolation and exposure to the cold evolved into a figurative expression used to describe situations where individuals are excluded or neglected, often intentionally, leaving them feeling isolated, unsupported, or uninformed, much like being left out in the frigid cold.