When his father refused to let him have his own way, the child played his trumpcard by crying.
看到爸爸没有如自己的意, 那孩子便使出绝招,哇的一声哭了起来。
《新英汉大辞典》
2
Still, many parents enroll their kids in private schools for thetrumpcard that top prep schools have long held: the powerful, highly connected college counselor.