What is the origin of idiom talk cheap?

The idiom "talk cheap" likely emerged in the late 19th or early 20th century, when talking was often associated with the ability to sell something.

Here's how the idiom likely developed:

* "Cheap talk" was originally used to describe empty promises or boasting without any real substance, essentially "talking a big game."

* This concept was extended to describe people who were willing to talk a lot but were not willing to back up their words with action or money.

* Over time, "talk cheap" evolved to describe people who criticize or express opinions freely without considering the consequences or the cost of their words. This is where the "cheap" element emphasizes the perceived lack of value or substance in their words.

The idiom's origin isn't definitively documented, but its evolution reflects a societal shift towards evaluating the value of words beyond mere expression. It emphasizes that words need to be backed by action and that thoughtfulness and responsibility should be exercised when speaking, especially when discussing sensitive or costly matters.