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

1.
群集心理, 集団行動
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.
株式市場の暴落は、皆がパニックになって株を売却したため、部分的に群集心理によるものだった。
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It's important to resist herd mentality and make your own informed decisions.
群集心理に抵抗し、自分自身の情報に基づいた決定を下すことが重要です。