Sc. Obs. Also 7 boystour, boisture. [The variant boistour suggests identity with BOASTER; and the earlier senses of BOAST in Sc. boist) give a suitable meaning; but the form bystour is not explained.]
A loud rude talker; a braggart, bully.
1535. Lyndesay, Satyre, 2991. That bystour salbe brunt incontinent.
a. 1600. Montgomerie, Flyting, 125. Bleird, babling, bystour-baird, obey. Ibid., 215. Ridand like boistures all beshitten. Ibid., 655. Beshitten boystour [ed. 1688 by-stour].
