Definitions of sauce:

• noun:   flavorful relish or dressing or topping served as an accompaniment to food
• verb:   behave saucy or impudently towards
• verb:   add zest or flavor to, make more interesting

  Example: "Sauce the roast"

• verb:   dress (food) with a relish
• name:  A surname (very rare: popularity rank in the U.S.: #78705)