Definitions of crease:

• noun:   an angular or rounded shape made by folding

  Example: "A crease in his trousers"

• noun:   a Malayan dagger with a wavy blade
• noun:   a slight depression in the smoothness of a surface
• verb:   scrape gently
• verb:   make wrinkled or creased
• verb:   make wrinkles or creases into a smooth surface
• verb:   become wrinkled or crumpled or creased
• name:  A surname (very rare: popularity rank in the U.S.: #86432)