Definition of do in phrasal verb from the Oxford Advanced Learner's Dictionary

 

do in

 phrasal verb
phrasal verb
 
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Phrasal Verbs

    do somebody in

    |

    do yourself in

    (informal)
     
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  1. 1to kill somebody/yourself
  2. 2[usually passive] to make somebody very tired Come and sit down—you look done in.
(informal) to injure a part of the body He did his back in lifting heavy furniture.
See the Oxford Advanced American Dictionary entry: do in