off one's trolley

The idiom "off one's trolley" is often used in British English to describe someone who is behaving in a crazy or irrational manner. The phrase is believed to have originated in the early 20th century, around the time when trolley cars were a common mode of transportation in many cities. Trolley cars were powered by electricity and moved along tracks, which made them a novel and somewhat unpredictable means of travel. It is likely that the idiom drew inspiration from the idea of someone being thrown off or disconnected from a trolley, metaphorically representing a departure from rationality or sanity.

Another possible origin of the phrase comes from the usage of trolleys in mental institutions during the same time period. Trolleys were often used to transport patients or equipment within these facilities, and it is reasonable to assume that a patient who was "off their trolley" would be seen as mentally disturbed or unbalanced. This connection between trolleys and mental health may have contributed to the idiomatic usage of the phrase.

While the exact origin is uncertain, it is safe to say that "off one's trolley" became a popular idiom in British English, and it has since been adopted to some extent in other English-speaking countries. In usage, the phrase is typically employed to describe someone who is acting in a way that is unexpected, bizarre, or nonsensical. It can be used to convey a sense of disbelief or amusement at someone's irrational behavior.

Both "off one's nut" and "off one's tree" can be seen as variations of the original idiom "off one's trolley". They all describe someone who is acting in a bizarre or irrational manner, but each phrase has its own nuances and level of informality.

Although primarily used in spoken English, the idiom "off one's trolley" has also found its way into written works, including literature and journalism. Its use in these contexts helps to cement its place in the English language and ensures that it will continue to be understood by future generations.

While the idiom "off one's trolley" has a specific meaning today, its exact origins and evolution remain somewhat elusive. The theories surrounding its connection to trolley cars and mental institutions provide us with plausible explanations, but we cannot state with certainty how and why this idiom came into existence. Nevertheless, it stands as a well-established and widely understood phrase, capturing the essence of irrational behavior in a concise and memorable manner.