poach

from The American Heritage® Dictionary of the English Language, 5th Edition.

• intransitive verb To take fish or game illegally, especially by trespassing on another's property.
• intransitive verb To take or appropriate something unfairly or illegally.
• intransitive verb To encroach on another person's rights or responsibilities.
• intransitive verb Sports To play a ball out of turn or in another's territory, as in doubles tennis.
• intransitive verb To become muddy or broken up from being trampled. Used of land.
• intransitive verb To sink into soft earth when walking.
• intransitive verb To take (fish or game) illegally, especially by trespassing on another's property.
• intransitive verb To take or appropriate unfairly or illegally.
• intransitive verb Sports To play (a ball) out of turn or in another's territory.
• intransitive verb To make (land) muddy or broken up by trampling.
• transitive verb To cook in a boiling or simmering liquid.

from The Century Dictionary.

• To intrude or encroach upon another's preserves for the purpose of stealing game; kill and carry off game in violation of law.
• To trespass upon, especially for the purpose of killing and stealing game.
• To poke; thrust; push; put.
• To stab; pierce; spear: as, to poach fish.
• To tread; break up or render slushy by frequent treading; mark with footprints.
• To make a thrust in or as in sword-play.
• To be penetrable, as soft muddy or marshy ground; be damp and swampy.
• To gain an unfair advantage at the start of a race.
• To cook by breaking the shell and dropping the contents whole into boiling water: said of eggs.

from the GNU version of the Collaborative International Dictionary of English.

• intransitive verb To become soft or muddy.
• transitive verb To cook, as eggs, by breaking them into boiling water; also, to cook with butter after breaking in a vessel.
• transitive verb To rob of game; to pocket and convey away by stealth, as game; hence, to plunder.
• transitive verb obsolete To stab; to pierce; to spear, as fish.
• transitive verb obsolete To force, drive, or plunge into anything.
• transitive verb To make soft or muddy by trampling.
• transitive verb obsolete To begin and not complete.
• intransitive verb To steal or pocket game, or to carry it away privately, as in a bag; to kill or destroy game contrary to law, especially by night; to hunt or fish unlawfully.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• verb transitive to cook something in simmering water
• verb To become soft or muddy.
• verb To make soft or muddy.
• verb transitive, intransitive to take game or fish illegally while trespassing on someone's property
• verb transitive, intransitive to take anything illegally or unfairly
• verb transitive, intransitive to cause an employee or customer to switch from a competing company to your own company

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• verb hunt illegally
• verb cook in a simmering liquid