Definition of pile on phrasal verb from the Oxford Advanced American Dictionary

 

pile on

 phrasal verb
phrasal verb
 
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Phrasal Verbs
(especially of a person's weight) to increase quickly The weight just piled on while I was abroad.

    pile somethingon

     
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  1. 1to make something increase rapidly The team piled on the points in the first half of the game. I've been piling on the pounds (= I have put on weight) recently.
  2. 2to express a feeling in a much stronger way than is necessary Don't pile on the drama! Things aren't really that bad—she does tend to pile it on.
  3. 3to give someone more or too much of something The Canadian team piled on the pressure in the last 15 minutes.

pile something on(to) somebody

 
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to give someone a lot of something to do, carry, etc. He felt his boss was piling too much work on him.
See the Oxford Advanced Learner's Dictionary entry: pile on