guru : Idioms & Phrases
computer guru
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noun an authority on computers and computing
computer expert.
WordNet
guru nanak
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noun Indian religious leader who founded Sikhism in dissent from the caste system of Hinduism; he taught that all men had a right to search for knowledge of God and that spiritual liberation could be attained by meditating on the name of God (1469-1538)
Nanak.
WordNet
media guru
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noun someone who advises about the use of communication media
media consultant.
WordNet
unix guru
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noun an expert on the UNIX operating system