What is the meaning of streak?

noun

• An unbroken series of events.
  • usage: "had a streak of bad luck"; "Nicklaus had a run of birdies"
  • synonyms: run
• A distinctive characteristic.
  • usage: "he has a stubborn streak"; "a streak of wildness"
• A narrow marking of a different color or texture from the background.
  • usage: "a green toad with small black stripes or bars"; "may the Stars and Stripes forever wave"
  • synonyms: stripe, bar
• A sudden flash (as of lightning. )

verb

• Move quickly in a straight line.
  • usage: "The plane streaked across the sky"
• Run naked in a public place.
• Mark with spots or blotches of different color or shades of color as if stained.
  • synonyms: mottle, blotch