sink (v.)
下沉、沉没

例句：
The ship sank after the collision.
船碰撞后就沉没了。

a rolling stone
滚石、漂浮不定的人
 
例句：
Let me see. You are twenty-two and have been a clerk, a traveller, and a porter. Keep to one job; a rolling stone gathers no moss.
让我看看。你现在二十二岁，当过店员、旅行者和搬运工。你应该坚持一项工作；滚石不生苔，转业不聚财。
 

Suit yourself.
随你便。

对话：
A: I want to cut my hair short for a change.
B: All right. If you like, suit yourself.

A：我想改变一下发型，把头发简短了。
B：好吧。如果你喜欢，随你便吧。