na-adjective
full-speed dash; sudden
Obsolete adjectival noun meaning a sudden, full-speed rush. Modern Japanese uses まっしぐら or 突然 instead.
See also: まっしぐら
古典では「驀地に走る」のように使われたが、現代ではまず見かけない。
In classical texts it was used like 'to dash at full speed,' but it is hardly seen today.