Etymology
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rustler (n.)

1820, "one who or that which rustles" (a leaf, a bird), agent noun from rustle (v.). The American English meaning "cattle thief" is by 1882; earlier it meant "active, efficient person" (1872).

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Definitions of rustler

rustler (n.)
someone who steals livestock (especially cattle);
Synonyms: cattle thief
From wordnet.princeton.edu