Definition of at a or one whack in English:

at a (or one) whack

At one time: he built twenty houses at one whack
More example sentences
  • I am on board the U.S. Coast Guard icebreaker Polar Star as it back-and-rams the frozen ocean to open up a fourteen-mile-long channel into McMurdo Station, fifty feet at a whack.
  • The basic premise was that we would commence with a 24-inch barrel, test for accuracy and velocity, and then shorten it two inches at a whack before repeating our testing.
  • Unfortunately we're stuck on hold for 5 minutes at a whack because these sites aren't on the allowed list.
See parent entry: whack

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having a lively, cheerful, and self-confident manner...