Meaning

• The outer skin of a citrus fruit, used as a flavouring or garnish.

  "The orange zest gives the strong flavor in this dish."

• General vibrance of flavour.

  "I add zest to the meat by rubbing it with a spice mixture before grilling."

• (by extension) Enthusiasm; keen enjoyment; relish; gusto.

• The woody, thick skin enclosing the kernel of a walnut.

Meaning

• To scrape the zest from a fruit.

• To make more zesty.