СТАДНОЕ ЧУВСТВО usu.disapprovNPsing only) the inclination to conform to the behavior of the crowd
herd instinct.
«Зачем ты накупил столько лотерейных билетов? Ведь всё равно не выиграешь» - «Стадное чувство: все покупали помногу - и я купил». "Why did you buy so many lottery tickets? You won't win anything anyway." "It was the herd instinct. Everyone was buying a lot so I bought a lot too."