back a horse

• 下赌注

back a horse的用法和样例：

例句

1. The horse I had backed trailed in last.
   我下赌注的那匹马落在後面，跑了个倒数第一。
2. Arnold has always been a high roller when it came to gambling.
   赌博时，阿诺德总是不考虑后果乱下赌注。