herd mentality
US /hɜrd menˈtæl.ə.ti/
UK /hɜrd menˈtæl.ə.ti/

1.
mentalidad de rebaño, comportamiento de manada
a situation in which people act like a herd, without thinking for themselves, often leading to irrational or dangerous decisions
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The stock market crash was partly due to herd mentality, as everyone panicked and sold their shares.
La caída del mercado de valores se debió en parte a la mentalidad de rebaño, ya que todos entraron en pánico y vendieron sus acciones.
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It's important to resist herd mentality and make your own informed decisions.
Es importante resistir la mentalidad de rebaño y tomar tus propias decisiones informadas.