1 loose cannon

松動的大炮（一觸即發的脾氣）

She is a loose cannon. = She is unpredictable and could cause trouble.

她喜怒無常，很能惹事。

例子：Don't argue with him after he drinks too many beers. He is a loose cannon when he is drunk.

他灌飽了啤酒時不要跟他爭論。他喝醉了就像個松動的大炮。

1 six one way, half a dozen the other

一邊六個，一邊半打（半斤八兩）

It is six one way, half a dozen the other. = It is basically equal.

兩邊基本一樣。

例子：I think that if we go north and then east to get there or east and then north to get there it will be six one way, half a dozen the other.

去那個地方，無論先往北走，再折向東邊，或者先往東走，再折向北邊，都是一樣的。

1 light a fire under your butt

在屁股下點一把火（促其行動）

I had to light a fire under his butt. = I had to give him a reason to motivate himself.

我得想辦法讓他行動起來。

例子：He graduated nine months age, but still hasn't found a job. I decided to light a fire under his butt so I told him that if he didn't find a job in one month, he would have to move out.

他畢業已經九個月了，還沒有找到工作。我得想辦法讓他行動起來，所以我告訴他，要是一個月里還找不到工作，就得搬出去。