Definition of at lightning speed
: extremely quickly
at lightning speed
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lightning
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: the flashing of light produced by a discharge of atmospheric electricity
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: a sudden stroke of fortune
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: having or moving with or as if with the speed and suddenness of lightning
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: to discharge a flash of lightning
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speed
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: prosperity in an undertaking : success
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: the act or state of moving swiftly : swiftness
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: rate of motion: such as
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: to prosper in an undertaking
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: get along, fare
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: to make haste
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