Corrugate (verb)

1. To shape or form into a series of parallel, undulating ridges and grooves.
2. To form wrinkles, furrows, or ridges on the surface of something.

Origin:

From the latin word corrugatus, meaning "wrinkled" or "folded".

Examples:

1. The metal was corrugated to give it added strength.
2. The cardboard had been corrugated to make it more durable.
3. He corrugated his forehead in a frown.
4. The corrugated roofing was designed to drain water quickly.
5. The process of corrugating the metal made it more resistant to bending.