今天介绍的俚语是pitch in，pitch in是什么意思呢？最常见得意思是一起帮忙，做出贡献(to join in and help someone with something).

例句：
If you could pitch in a little we'd be finished quicker.
如果你能帮忙一下，我们很快就可以完成。

After the Christmas dinner, we all pitched in to clean up the house.
圣诞晚餐后,我们全都动手帮助清理房子。

If everyone pitches in, we'll soon get the job done.
如果大家一起拼命干，我们很快就会把这个工作干完。

读者可以尝试翻译一下：

Would you please pitch in and help with the party? Come on! Pitch in!

pitch in还有其他的意思：

1.分担共同担负的费用；捐献(某物)；(以某物)支援：
例句：
When they took up a collection for the annual dinner, he promised to pitch in.
当他们为一年一度的聚餐筹款时，他答应捐款。

2.投入；把…扔进去：
例句：
Please pitch your waste paper in here
请把废纸扔在此地。

3.大吃特吃，开始大吃：
例句：
As soon as the food was put on the table, all the children pitched in without waiting to be invited.
食物一端上桌子，孩子们用不着请便大吃起来。