I need an answer please dont rush make it right When David finally got a chance to sneak out for a breathing spell, he felt his heart sink.

Underline the sentence in the paragraph below that best helps you understand the meaning of the phrase sneak out for a breathing spell:

When the ironing board was finally located, Mother had something for him to do. And when he was finished with that, Dad called for his help. So the afternoon wore on without letup—and also without any signs of progress in their moving. When David finally got a chance to sneak out for a breathing spell, he felt his heart sink. Somehow, in all the rush and confusion, the afternoon had disappeared. Already the evening sun was throwing shadows across the side of the mountain and touching its peak with a ruddy blaze. It was too late now. He would have to wait until morning before he could climb.