1. to wrinkle, crease, or fold into small ridges or waves
Usage: informal; chiefly British

Examples

• The fabric began to crimple when she washed it in hot water.
• Don't crimple the letter—fold it carefully.
• His shirt was all crimpled after being packed in the suitcase.
• The paper crimpled at the edges from humidity.
• She crimpled the foil to fit it into the container.