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.
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