Etymology
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wrecker (n.)

1804, in reference to those who salvage cargos from wrecked ships, from wreck (n.). In Britain often with a overtones of "one who causes a shipwreck in order to plunder it" (1820); but in 19c. Bahamas and the Florida Keys it could be a legal occupation. Applied to those who wreck and plunder institutions from 1882. Meaning "demolition worker" attested by 1958. As a type of ship employed in salvage operations, from 1789. As a railway vehicle with a crane or hoist, from 1904.

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Definitions of wrecker

wrecker (n.)
someone who demolishes or dismantles buildings as a job;
wrecker (n.)
someone who commits sabotage or deliberately causes wrecks;
Synonyms: saboteur / diversionist
wrecker (n.)
a truck equipped to hoist and pull wrecked cars (or to remove cars from no-parking zones);
Synonyms: tow truck / tow car
From wordnet.princeton.edu