hackle
US /ˈhæk.əl/
UK /ˈhæk.əl/

1.
頸羽, 頸毛
a long, narrow feather on the neck or lower back of a domestic fowl, especially a rooster.
:
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The rooster's iridescent hackles shimmered in the sunlight.
公雞閃光的頸羽在陽光下閃爍。
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The dog's hackles rose when it sensed danger.
狗感到危險時,頸毛豎了起來。