sitting duck

noun
🔊/ˌsɪtɪŋ ˈdʌk/
🔊/ˌsɪtɪŋ ˈdʌk/
(also sitting target)
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  1. a person or thing that has no protection against attack易受攻击者;易被击中的目标
    • Its location makes the island a sitting duck for attackers.它的位置使该岛成为攻击者的野鸭。