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骑师;骑手;骑马(或自行车、摩托车)的人
A rider is someone who rides a horse, a bicycle, or a motorcycle as a hobby or job. You can also refer to someone who is riding a horse, a bicycle, or a motorcycle as a rider.
例句
She is a very good and experienced rider...
她是一位经验丰富的优秀骑师。
As we came out of the stables, a rider came towards us.
当我们走出马厩的时候，一个人骑着马向我们走了过来。