advb. phr. [A prep.1 + RIOT.] In riot, riotously, running riot.
1851. Mary Howitt, Sk. Nat. Hist. (ed. 7), 14. Till the Parrots, all a-riot, Chattered too to keep you quiet.
1881. Cornh. Mag., March, 310. The rose-trees … have gone wandering a-riot into country hedges.
