Definitions of eat:

• verb:   eat a meal; take a meal

  Example: "We did not eat until 10 P.M. because there were so many phone calls"

• verb:   take in solid food

  Example: "She was eating a banana"

• verb:   worry or cause anxiety in a persistent way

  Example: "What's eating you?"

• verb:   cause to deteriorate due to the action of water, air, or an acid
• verb:   take in food; used of animals only

  Example: "This dog doesn't eat certain kinds of meat"

• verb:   use up (resources or materials)