Destender la ropa

Regarding the RAE and its online dictionary, I have to agree with Sergio. I've tried today to find an expression that I heard yesterday, "destender la ropa", in English it may be "to take clothes from a clothesline". Unfortunately, nothing could be found. Using a simple Google search, I found many links to that term, including the following video of a dog who está ayudando a destender la ropa.