pitch in

1. 动手做, 使劲做

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。

They all pitched in and finished the work within two hours.

他们全部努力地做, 两小时内就把工作完成了。

2. 协力, 做出贡献

We all pitched in to buy Uncle George a birthday present.

我们大家出钱给乔治叔叔买生日礼物。

pitch into

1. 投入

They pitched into action to save the wounded.

他们积极投入抢救伤员的工作。

2. 猛烈攻击

He became furious and pitched into that fellow with fists.

他大怒起来, 挥拳殴打那家伙。

pitch on/upon

1. (偶然) 选中

You were lucky to be pitched on.

你被选中, 真是幸运。

queer sb.'s pitch

1. 破坏某人的计划

It will really queer our pitch if it rains tomorrow.

如果明天下雨, 我们的计划就成泡影。