Definition of overspeed
(Entry 1 of 3)
: speed greater than normal or rated speed
subjected to overspeeds — Time
overspeed
verbDefinition of overspeed (Entry 2 of 3)
: to cause (as an engine) to run at an excessive speed
: to run at an excessive speed
overspeed
adjectiveDefinition of overspeed (Entry 3 of 3)
: operated or operating at greater than normal or rated speed
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Merriam-Webster unabridged
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