sneak off: 潜出、潜逃
The cat ate the food and sneaked off.
猫吃完食物就偷偷跑了。
He slipped out while I was telling Mrs. Banting off.
我在教训班丁太太的时候他溜出去了。

be forced to: 被迫、不得不
It used to be considered a great shame of a family to be forced to go on the parish.
一个家庭不得不领取教区救济金，在过去被认为是一种耻辱。
The building society will be forced to foreclose on this mortgage because regular payments have not been made.
住宅互助协会被迫取消这项抵押的赎取权，因为没有交纳定期的付款。

on second thought: 经过重新考虑、再仔细考虑
I said I wouldn't do it, but on second thought I think I will.
我说我不会做此事，但再细想一下我想我是会做的。
He have intended to go, but on second thought, he give up the idea.
他本来想去，但进一步考虑後，打消了这个念头。