crumple
verb (used with object)
to press or crush into irregular folds or into a compact mass; bend out of shape; rumple; wrinkle.
Used to describe an action that was ongoing continuously in the past up until another past event interrupted it.
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
His hands, that had been crumpling up the sheet, were now laid flat before him.
From If Winter Comes by A. S. M. (Arthur Stuart-Menteth) Hutchinson