In one fell swoop(idiom)
All in one go.
Hindi meaning:एक बार में
Synonyms: All at once, Together, At one fling, Outright, With one move
Antonyms: Gradually, Distinctly, Bit by bit, Successively
Example: I got all my Christmas shopping done in one fell swoop.
Trick to remember: Yha sab fell ho jate hai In one fell swoop me . 
