Definitions of streak:

• noun:   a distinctive characteristic

  Example: "He has a stubborn streak"

• noun:   a sudden flash (as of lightning)
• noun:   an unbroken series of events

  Example: "Had a streak of bad luck"

• noun:   a marking of a different color or texture from the background
• verb:   move quickly in a straight line

  Example: "The plane streaked across the sky"

• verb:   run naked in a public place
• verb:   mark with spots or blotches of different color or shades of color as if stained