fall off a truck

The idiom "fall off a truck" is believed to have originated in the United States. It is a common expression used to describe the acquisition of stolen or illegally obtained goods.

This idiom is often used humorously or sarcastically to suggest that the speaker or someone else acquired an item without paying for it, but without directly admitting to any wrongdoing. The phrase is also used to convey a sense of secrecy or confidentiality, as if the speaker is sharing a secret or inside knowledge.

The origins of the idiom can be traced back to the mid-20th century in the transportation industry, particularly the trucking or shipping industry. The specific details of how the idiom came into use are unclear, but it likely emerged as a colloquial expression among workers in these industries.

One possible explanation for the origin of the idiom is that it refers to stolen goods being transported in trucks. The phrase "fall off a truck" could be a euphemism for the act of stealing or illegally obtaining goods and then transporting them in a truck. This interpretation aligns with the notion of the idiom suggesting the acquisition of illicit goods.

Another possible origin of the idiom is that it refers to items accidentally falling off a truck during transport. In this interpretation, the idiom could allude to the idea of finding or acquiring something that was lost or discarded during transit. However, this usage is less common, and the idiom is generally understood to imply the acquisition of stolen goods rather than discarded ones.

While the idiom is primarily used in a figurative sense, it is important to note that the phrase can also be used literally to describe objects actually falling off a truck. In this literal sense, the idiom may be used to convey a sense of surprise or disbelief when something unexpected occurs, such as witnessing an object fall off a moving truck.

Similarly, "fall off the back of a lorry" is a British variation of the idiom. In the UK, trucks are commonly referred to as lorries, so the phrase reflects the regional differences in language use.

A different idiom that uses the word "fall off" is "fall off the wagon." This expression is used to describe someone returning to a previously abandoned bad habit or addiction. It originated in the context of alcoholism, where "falling off the wagon" referred to someone resuming drinking after a period of sobriety. The phrase has since been adopted to describe any instance of relapse or returning to a previously abstained behavior.