Suddenly
来自Big Physics
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Middle English: from Anglo-Norman French sudein, from an alteration of Latin subitaneus, from subitus ‘sudden’.
wiktionary
From Middle English sodenly, sodeynly, sodeinliche, sodaynlyche; equivalent to sudden + -ly.
etymonline
suddenly (adv.)
late 13c., sodeinli; see sudden + -ly (2).