VERY FAST, very quickly, rapidly, speedily, swiftly, hurriedly, at full tilt, at full pelt, headlong, hotfoot, post-haste, helter-skelter, at the speed of light, at breakneck speed; informal like a bat out of hell, like the wind, like greased lightning, like a bomb; Brit. informal like the clappers, at a rate of knots; N. Amer. informal lickety-split.
2192; headword