Idiom meaning, usage examples, facts

1. Martha loves to knit sweaters for her children. She could buy them for less money than it costs her to make them, but they are a labor of love for her.
2. When Ralph built a wagon for his son, he picked out the wood himself, carefully sanded each piece, and handpainted it with more coats of paint than necessary. Building the wagon was a labor of love because it was for his son.