hi : Idioms & Phrases
hi-fi
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noun equipment for the reproduction of sound with high fidelity
high fidelity sound system.
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noun the reproduction of sound with little or no distortion
high fidelity.
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adjective satellite characterized by minimal distortion in sound reproduction
high-fidelity.
- a high-fidelity recording
- a hi-fi system
WordNet
hi-tech
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adjective resembling or making use of highly advanced technology or devices
high-tech.
WordNet
knee-hi
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noun a sock or stocking that reaches up to just below the knees
knee-high.