What does in one fell swoop mean?

[Stupy]

English Language Proficiency Tests, Advanced Level

ESL/EFL Test #545 "English Slang Idioms (148)", question 4

Tommy was pleased with the outcome of the chess game he had played with his next-door neighbor. He set a nice trap for his opponent and in one ......... swoop, he stole his opponent's queen, both rooks and a knight. After that, it did not take much time to end the game.

(a) grand
(b) fell
(c) large
(d) far-reaching

English Language Proficiency Tests, Advanced Level

ESL/EFL Test #545 "English Slang Idioms (148)", answer 4

Tommy was pleased with the outcome of the chess game he had played with his next-door neighbor. He set a nice trap for his opponent and in one fell swoop, he stole his opponent's queen, both rooks and a knight. After that, it did not take much time to end the game.

Correct answer: (b) fell
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what is the answer

[Linda]

Hello,
You are correct. The answer is (b) fell.
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