Past tense of 'speed,' meaning moved quickly or accelerated; though 'sped' is more common in modern English.
From Old English 'spēd' meaning luck, prosperity, or success, which evolved to mean quickness. Both 'sped' and 'speeded' are valid past tenses, with 'speeded' more common in specific contexts like 'speeded up.'
English verbs are inconsistent—we say 'sped' (like 'fled'), but also 'speeded' (like 'needed')—and even native speakers argue about which is 'correct,' showing how language rules are less fixed than people think!
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