Might be too late to start gatekeeping this term

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poach (verb) poached; poaching; poaches

Intransitive verb

1. To encroach upon, especially for the purpose of taking something.

2. To trespass for the purpose of stealing game; also, to take game or fish illegally.

Transitive verb

1. To trespass on.

2. a. To take (game or fish) by illegal methods.

  b. To appropriate (something) as one's own.  
   
  c. To attract (someone, such as an employee or customer) away from a competitor.