v. ? dial. [Of unknown origin; cf. Harrow school slang froust sb., extra sleep allowed in the morning of Sundays and whole holidays (Barrère and Leland).] intr. To rest lazily, lounge.
1884. Standard, 5 May, 4/4. A generation that frousts over the fire.
1889. B. Whitby, Awakening M. Fenwick, II. 182. I hate frowsting over a fire.