a person or thing that handles.
Boxing. a person who assists in the training of a fighter or is the fighter's second during a fight.
a person who exhibits a dog in a bench show or field trial.

1350–1400; Middle English. See handle, -er1

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World English Dictionary
handler (ˈhændlə)
1.  a person, esp a police officer, in charge of a specially trained dog
2.  a person who handles some specified thing: a baggage handler
3.  a person who holds or incites a dog, gamecock, etc, esp in a race or contest
4.  the trainer or second of a boxer

Handler (ˈhændlə)
Daniel. born 1970, US writer for older children, best known for the macabre humour of his A Series of Unfortunate Events, a sequence of books written in the persona of Lemony Snicket

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
The same thing applies to the duct-work as stated for the air handler.
The beagle would sit next to a suspicious-smelling bag, wag his tail, look
  excited and then look to his handler for praise.
Not everyone who handles food needs a food handler's certificate.
When the dog cannot make a positive decision, he will look to the handler for a
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