Crumple

You're not a serious mathematician unless you crumple up a piece of paper in frustration every twenty minutes, look off into space, and appear to be questioning your very existence.

Do not fold or crumple this sheet.

He crumpled the note and threw it away.

He crumpled the car's body panels when he backed into a post.

The car's body panels crumpled when they hit the post.

The team's defensive strategy crumpled.

The defenders crumpled owing to exhaustion and dehydration.

Yes, Juve were unfortunate, in the extreme, with the deflected goal from Casemiro that gave Madrid a 2-1 lead just after the hour. From that point onwards, however, it was staggering to see a team renowned for defensive structure crumple this way.