1.eat immoderately;
Some people can down a pound of meat in the course of one meal
2.serve oneself to, or consume regularly;
Have another bowl of chicken soup!
3.spend extravagantly;
waste not, want not
4.destroy completely;
The fire consumed the building
5.use up (resources or materials);
this car consumes a lot of gas
6.engage fully;
The effort to pass the exam consumed all his energy