Noun
Fisherian runaway (uncountable)
(evolutionary theory) A suggested sexual selection mechanism to account for the evolution of exaggerated male ornamentation (such as a peacock's plumage) by persistent, directional female choice.
The Fisherian runaway describes how sexual selection accelerates the preference for a specific ornament, causing the preferred trait and female preference for it to increase together in a positive feedback runaway cycle. Source: Internet