Crumpling

Playing, such as crumpling paper into a ball or tearing into pieces, helps develop children's creativity.

Sami was crumpling the bag.

Sami stopped crumpling the bag.

Ziri stopped crumpling the bag.

But it was only Aimée, in her gray cloak; and as the door closed behind her, that small person advanced toward him, crumpling her white forehead and looking quite disturbed at the mere sight of him.

Watt saw the little movements of the stuff, the little bulgings and crumplings, and the sudden indrawings, where it was nipped, between forefinger and thumb probably, for those are the nippers.

When strata are so unsymmetrically and abundantly folded that it becomes difficult or impossible to trace out the individual flexures and crumplings — the whole forming an irregular complex of folds — they are said to be contorted […]