Be like a deer caught in the headlights: to be so frightened or surprised that you cannot move or think

这个常用口语的意思是被惊吓到无法移动或者思考的地步。

当鹿在晚上被汽车的车灯直接照射到眼睛的时候，会暂时失明而呆立在原地不动。以上口语的典故就是出于此现象。

造句：

Each time they asked him a question he was like a deer caught in the headlights. He really needs training on public speech.