单词：ride_herd 

动词

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  [1.v.ride_herd] (同义词:[ride_herd]  )
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  注释列句：driving animals such as horses and cattle while riding along with them; "Joe was riding herd during the day"
• 上位词 -> [ride( v. 骑, 乘 n. 骑, 乘 )]  [travel( v. 旅行, 传播 vi. 行进, 传播 n. 旅行 )]