Definitions of brisk:

• verb:   become brisk

  Example: "Business brisked up"

• adjective:   very active

  Example: "Doing a brisk business"

• adjective:   quick and energetic

  Example: "A brisk walk in the park"

• adjective:   imparting vitality and energy
• name:  A surname (very rare: popularity rank in the U.S.: #65343)