danger (n.) Look up danger at Dictionary.com
mid-13c., "power of a lord or master, jurisdiction," from Anglo-French daunger, Old French dangier "power, power to harm, mastery, authority, control" (12c., Modern French danger), alteration (due to assoc. with damnum) of dongier, from Vulgar Latin *dominarium "power of a lord," from Latin dominus "lord, master," from domus "house" (from PIE root *dem- "house, household").

Modern sense of "risk, peril" (from being in the control of someone or something else) evolved first in French and was in English late 14c. Replaced Old English pleoh; in early Middle English this sense is found in peril.