lemming
/ˈlemɪŋ; `lɛmɪŋ/ n
small mouse-like rodent of the arctic regions which migrates in large numbers, often with many of the animals drowning in the sea 旅鼠（栖居极地一带的小型啮齿动物, 定期集体迁徙, 常径直入海溺亡）
a lemming-like readiness to follow their leaders into certain disaster 象旅鼠一样盲目追随领袖赴汤蹈火.