• (in combination) A controller, trainer, someone who handles a specified thing, animal or person (especially a prizefighter).

    "The spy's handler told him to approach the subject by posing as a dog handler."

  • (literally) One who handles something (especially manually) or someone.

    "The handler of a weapon gets a symbolic sensation of deadly power."

  • (computing) A subroutine that handles a particular situation such as an event or exception.

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