What is the origin of the idiom "speaking terms" and when to use it?

The origin of the phrase is not entirely clear, but it is believed to have originated in the late 1700s or early 1800s. It may have emerged from the idea that speaking or communicating with someone is a sign of a positive relationship or mutual understanding. Alternatively, it may have derived from the concept of "terms" in a negotiation or agreement, suggesting that two parties are on "speaking terms" when they are able to communicate effectively and reach a mutual understanding. Regardless of its origin, the phrase remains in use today to describe a positive relationship between individuals who had previously been at odds.