Definition & Meaning of "be for naught"in English

What is the origin of the idiom "be for naught" and when to use it?

The origin of the idiom "be for naught" is uncertain, but it has been in use since the 16th century. Today, the idiom is commonly used to describe a situation where someone has put in a lot of effort, time, or resources into something, but the outcome has been disappointing or unsuccessful. The idiom implies that the person's efforts were in vain and that they have achieved nothing or very little.