Definition of eat into phrasal verb from the Oxford Advanced Learner's Dictionary

 

eat into

 phrasal verb
phrasal verb
 
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Phrasal Verbs
  1. 1to use up a part of something, especially somebody’s money or time Those repair bills have really eaten into my savings.
  2. 2to destroy or damage the surface of something Rust had eaten into the metal.
See the Oxford Advanced American Dictionary entry: eat into