Etymology
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handler (n.)

late 14c., "one who handles" anything, agent noun from handle (v.). Specific sense of "one engaged in trade" is from 1690s; that of "prizefighter's assistant" (1916) was earlier used in reference to dogfights and cockfights (1825).

updated on August 07, 2012

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Definitions of handler from WordNet

handler (n.)
one who trains or exhibits animals;
Synonyms: animal trainer
handler (n.)
an agent who handles something or someone;
the senator's campaign handlers
handler (n.)
(sports) someone in charge of training an athlete or a team;
Synonyms: coach / manager
From wordnet.princeton.edu, not affiliated with etymonline.