1660s, risque, from French risque (16c.), from Italian risco, riscio (modern rischio), from riscare "run into danger," of uncertain origin. The Englished spelling first recorded 1728. Spanish riesgo and German Risiko are Italian loan-words. With run (v.) from 1660s. Risk aversion is recorded from 1942; risk factor from 1906; risk management from 1963; risk taker from 1892.
1680s, from risk (n.), or from French risquer, from Italian riscare, rischaire, from the noun. Related: Risked; risks; risking.