adverb taking the 'to' particle, taru-adjective
rapidly; quickly; with great strides
Literary adverb describing swift progress, often of time or events. Used with と (to) or in たる (taru) adjective form. Modern equivalents include どんどん or 急速に.
歳月は駸々として過ぎ去る。
The years pass swiftly.
彼は駸々たる勢いで出世した。
He rose rapidly through the ranks.
adverb taking the 'to' particle, taru-adjective
galloping swiftly (of a horse)
Archaic original meaning, referring specifically to a horse running fast. Now only encountered in classical texts.
古語では、馬が駸々と走る様を表した。
In classical language, it described a horse galloping swiftly.
Standard noun/adjective for 'rapid' or 'quick'; 駸々 is more poetic and archaic.
The kanji 駸 means 'galloping horse' and the repetition emphasizes continuous swift motion. The exact historical derivation is uncertain; the word is a rare literary term.