碰头的英文：
[Informal] to meet (and discuss something); to get together

参考例句：

Mind your head
当心碰头

Mind you don't bump your head on the low ceiling.
天花板很低，留神别碰头。

The committee members went into a huddle with the chairperson.
委员会成员与主席私下碰头开会。

They had appointed to meet us at the entrance of the theatre.
他们约定在剧场门口和我们碰头。

They huddled to discuss the matter.
他们私下碰头讨论这件事。

We changed to meet in the park that morning.
我们改在那天早晨在公园碰头。

The door was held open by a doorstop.
那门用了门碰头,一直开着.

The group leaders meet once a week.
组长们每周碰头一次(开会)。

Let's get together and discuss how to solve the problem
让我们碰头研究一下如何解决这个问题。

He promised to meet us downtown without fail.
他答应一定在市中心跟我们碰头。

informal是什么意思：
adj. 非正式的；口语体的，通俗的；不拘礼节的

Informed judgement.
有事实根据的判断。

This is an informal expression.
这是一种非正式表达法。

This is an informal word.
这是一种口语用语。

meet是什么意思：
n. 运动会，体育比赛，猎狐运动
v. 相遇，相逢，遇见，相识，结识，开会，经历，支付

They boycotted the meeting.
他们拒绝参加那个会议。

Nice to meet you. Nice to meet you, too.
很高兴认识你。 我也很高兴认识你。

Nice to meet you. Nice to meet you, too.
很高兴认识你。 我也很高兴认识你。

discuss是什么意思：
v. 讨论，谈论，商量；详述，论述

Stop discussing for the moment, please.
请暂停讨论。

They discussed the weather and other topics.
他们讨论了气候和其他的话题。

The discussion deteriorated into a bitter quarrel.
这场讨论演变成了激烈的争吵。