ring,马戏场，leader,领班，老板。字面意思即马戏场老板，比喻用法。

1. He spilled it that Bill was their ringleader.

他透露比尔是他们的主谋.

来自《简明英汉词典》

2. To catch bandits , first catch the ringleader.

擒贼先擒王.

来自《现代汉英综合大词典》

3. 'He's the cook ; and the ringleader, too.'

“ 他是船上的厨子, 也是那帮家伙的头目. ”

来自英汉文学 - 金银岛

4. Here is the ringleader of the gang that trespassed on your grounds.

这就是侵犯你土地的那伙人的头子.

来自辞典例句

5. The ringleader was shot to death in a gun battle.

主犯在枪战中被击毙.

来自辞典例句