At the very moment when she would have seized her prey, the hare moved and darted along the balk between the winter rye and the stubble.
Again Erza and Milka were abreast, running like a pair of carriage horses, and began to overtake the hare, but it was easier for the hare to run on the balk and the borzois did not overtake him so quickly.
That’s it, come on!" came a third voice just then, and "Uncle’s" red borzoi, straining and curving its back, caught up with the two foremost borzois, pushed ahead of them regardless of the terrible strain, put on speed close to the hare, knocked it off the balk onto the ryefield, again put on speed still more viciously, sinking to his knees in the muddy field, and all one could see was how, muddying his back, he rolled over with the hare.
There are no more uses of "balk" in the book.
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Our teacher balked at the suggestion of an open-book test.