Etymology
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poacher (n.)

1660s, "one who poaches game, one who intrudes on the preserves of another for the purpose of killing game unlawfully," agent noun from poach (v.1). Attested from 1846 as "vessel for poaching eggs," from poach (v.2).

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Definitions of poacher

poacher (n.)
someone who hunts or fishes illegally on the property of another;
poacher (n.)
a cooking vessel designed to poach food (such as fish or eggs);
poacher (n.)
small slender fish (to 8 inches) with body covered by bony plates; chiefly of deeper northern Pacific waters;
Synonyms: sea poacher / sea poker
From wordnet.princeton.edu