(as) neat as a (new) pin

1. 十分整洁

The room was neat as a new pin.

房间十分整洁。

not care a pin

1. 毫不在乎

She did not care a pin about it.

她对此毫不在乎。

not worth a pin

1. 一文不值

It's not worth a pin.

这东西一文不值。

on pins and needles

1. 如坐针毡

They waited on pins and needles for the football scores.

他们如坐针毡般地等待足球比分。

On hearing the news, she was on pins and needles.

一听到那消息, 她就坐立不安。

pin down

1. 用针钉住

Will you pin the paper down so it won't be blown away?

请你用针把纸钉住, 不让它吹走好吗?

2. 确定

You must pin down every quotation to its author.

你一定要确定每一条引文的作者是谁。

3. 使受约束

We should pin him down to his promise.

我们应约束他遵守诺言。

pin up

1. 用针钉住

Let's pin up the map on the wall now.

现在让我们把地图钉在墙上。

pin on

1. 加罪于, 怪罪于

The robbery was pinned on the wrong defendant.

抢劫罪判错被告了。