Evidently the child has a poetic imagination, which must not be permitted to run riot.
They blaze on every mantel and run riot through all the rooms.
The English are naturally warm and impetuous; and in generous natures, affection is as apt as any other passion to run riot.
The American spirit of wastefulness should not run riot as it had in times past.
Can you wonder, then, that he is inclined to run riot outside?
We allow our imaginations to run riot, and our tongues do not rust for want of wagging.
The Feast of Fools was a kind of religious farce, a “mystery” run riot.
Some of the Boston newspapers have recently run riot in this respect.
It must be learned by wise gradations, and the learner must never be allowed to get out of hand or run riot with over-elaboration.
"Oh, but there's the studio to run riot in, Ellen," said Carey.
c.1200, "debauchery, extravagance, wanton living," from Old French riote (12c.) "dispute, quarrel, (tedious) talk, chattering, argument, domestic strife," also a euphemism for "sexual intercourse," of uncertain origin. Cf. Medieval Latin riota "quarrel, dispute, uproar, riot." Perhaps from Latin rugire "to roar." Meaning "public disturbance" is first recorded late 14c. Meaning "something spectacularly successful" first recorded 1909 in theater slang.
Run riot is first recorded 1520s, a metaphoric extension from Middle English meaning in reference to hounds following the wrong scent. The Riot Act, part of which must be read to a mob before active measures can be taken, was passed 1714 (1 Geo. I, st.2, c.5). Riot girl and alternative form riot grrl first recorded 1992.