Real Dictionary

poach
verb: If someone poaches fish, animals, or birds, they illegally catch them on someone else's property.

poach in American English 1
to sink into soft or wet earth when walking
to soften, tear up, or make holes in (ground) by stamping; trample
intransitive verb: to trespass, esp. on another's game preserve, in order to steal animals or to hunt
transitive verb: to trespass on (private property), esp. in order to hunt or fish

poach in American English 2
to cook (fish, an egg without its shell, etc.) in water or other liquid near boiling point, or in a small receptacle placed over boiling water
transitive verb: to cook (eggs, fish, fruits, etc.) in a hot liquid that is kept just below the boiling point

poach in British English 1
verb: to catch (game, fish, etc) illegally by trespassing on private property

poach in British English 2
verb: to simmer (eggs, fish, etc) very gently in water, milk, stock, etc