bird dog

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释义
细心观察，监视
To observe or follow closely; monitor.

例句
Bellick: We had an agreement. You were supposed to bird dog Scofield and get back to me. (Prison Break)
贝里克：我们是有约定的，你本该好好盯着斯科菲尔德，然后把消息汇报给我。（越狱）