rough-rider
/ˈrʌfˌraɪdə(r)/noun
1- N. Amer. a person who rides horses a lot〈北美〉经常骑马的人。
1.1
- a person who breaks in or can ride unbroken horses驯马人; 善骑未驯服的马的人。
1.2
Rough Rider
a member of a volunteer cavalry force during the Spanish-American War莽骑兵（西美战争中美国招募的志愿骑兵团的骑兵）。