expression, godan verb (-ru)
write with ease; draw with ease; one's brush flies
Describes writing or drawing smoothly and quickly, as if the brush moves on its own. Often used when inspiration or momentum carries the hand.
アイデアが浮かんで、筆が走った。
Ideas came to mind, and my brush flew across the page.
彼は一気に筆が走り、短編を書
His brush moved swiftly, and he finished the short story in one go.