1.take in solid food;
She was eating a banana
2.eat a meal; take a meal;
We did not eat until 10 P.M. because there were so many phone calls
3.take in food; used of animals only;
This dog doesn't eat certain kinds of meat
4.use up (resources or materials);
this car consumes a lot of gas
5.worry or cause anxiety in a persistent way;
What's eating you?
6.cause to deteriorate due to the action of water, air, or an acid;
The acid corroded the metal