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tech support

or tech·ni·cal sup·port

[tek suh-pawrt or tek-ni-kuh l suh-pawrt; ‐pohrt]
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noun
  1. an advising and troubleshooting service provided by a manufacturer, typically a software or hardware developer, to its customers, often online or on the telephone.
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Origin of tech support

First recorded in 1975–80
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018