acorn calf发育不全而又矮小的小牛

【使用地区】：美国西部

【释义】：

A runt or weak calf；sometimes used to describe a physically weak person．It was once believed that cows that ate too many acorns gave birth to such calves．

指发育不全而又矮小的小牛，有时也用来指身体瘦弱的人。以前曾经认为，母牛吃多了橡树的果实(即橡子)，就会生出这样的小牛。