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The Collaborative International Dictionary
To bristle up

Bristle \Bris"tle\, v. i.

  1. To rise or stand erect, like bristles.

    His hair did bristle upon his head.
    --Sir W. Scott.

  2. To appear as if covered with bristles; to have standing, thick and erect, like bristles.

    The hill of La Haye Sainte bristling with ten thousand bayonets.
    --Thackeray.

    Ports bristling with thousands of masts.
    --Macaulay.

  3. To show defiance or indignation.

    To bristle up, to show anger or defiance.

Usage examples of "to bristle up".

He was of a sickly colour, and his thin, sandy hair seemed to bristle up with the intensity of his emotion.

Rokeby was smoking, alone, in the dining-room early in the evening, when the dog began to bristle up his hair, and bark.