v. i. [ Probably fr. F. rustre boor, a clown, clownish, fr. L. rustucus rustic. See Rustic. ] To bluster; to swagger; to bully; to be bold, noisy, vaunting, or turbulent. [ 1913 Webster ]

I have a roisting challenge sent amongst
The dull and factious nobles of the Greeks. Shak. [ 1913 Webster ]

n. See Roisterer. [ 1913 Webster ]

n. A blustering, turbulent fellow. [ 1913 Webster ]

If two roisterers met, they cocked their hats in each other faces. Macaulay. [ 1913 Webster ]

a. Blustering; violent. [ R. ] [ 1913 Webster ]

adv. In a roistering manner. [ R. ] [ 1913 Webster ]