at one blow

at one blow (not comparable)

1. With one strike (of a hand, tool, or weapon).
   • 1884 [before 1557], Jacob Grimm, Wilhelm Grimm, Margaret Hunt, editors, The Valiant Little Tailor [European folk tale] (Grimm's Household Tales; 1):

     'There is no lack of strength,' answered the little tailor. 'Dost thou think that could be anything to a man who has struck down seven at one blow?'

• at one blast
• at one stroke