a sitting duck

• a sitting duck: 格好の標的

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• Rick: Our back-up is probably more than ten miles away! We're sitting ducks behind this car...
  （リック：　応援はたぶんまだ十マイルは先だ！　このまま車の陰に隠れてたんじゃ手も足も出ないぞ……）
  
  
  Robert Kirkman et al., The Walking Dead, VOL. 1: Days Gone By, Image Comics