They chip in for the petrol.

他们凑钱买煤气。

《柯林斯英汉双解大词典》

Shopkeeper: Hey. You guys finally chip in for a bodyguard?

店员：你们终于合伙雇了位保镖啦？

youdao

I know we've agreed to split the bill three ways. but you can't expect me to chip in for that.

我知道我们曾经说过三个人平均分摊费用，但你们不要指望我平分这笔费用。

youdao

Often,my friends and I will chip in or pay jointly for a fun night out.

VOA: special.2009.10.18

Colleagues, neighbours or relatives chip in for tickets to improve the chances of a big win.

ECONOMIST: Lottery players are rightly disgruntled

Airbnb could let six people chip in for the same booking at checkout.

FORBES: The Crowdfunding API Is Here: Welcome To A New Era Of E-Commerce

The idea of asking people to chip in for schools is not unprecedented, but it is usually a bit more subtle.

ECONOMIST: School funding: Public good, public cuts | The