on horseback
Um homem a cavalo vinha pelo caminho.
A man on horseback was coming down the road.
Eu andava a cavalo quando era criança.
I used to ride horses when I was a child.
O menino andou a cavalo pela primeira vez.
The boy rode a horse for the first time.
Ele quer batata frita a cavalo.
He wants french fries with a fried egg on top.
— Relatos Selvagens (2014)