Contribuir para comprar algo entre varias personas.

To chip in (AmE) (informal)

To have a whip-round (BrE) (informal).

Let's chip in and buy a crate of beer.

In Dictionaries:

"They each chipped in $50 to take their parents out to dinner."
Cambridge Dictionary Online.

"We all chipped in and bought flowers for the secretaries."
Merriam Webster

"If everyone chips in, we'll be able to buy her a nice leaving present."
Oxford Advanced Learner's Dictionary.

In News:

"They all chipped in for food and kept it quiet for the most part, Mark said."

The Star Phoenix.

"It is always moving to see football rally around one of its own, like the family having a whip round to buy Charlie a chocolate bar for his birthday."

The Telagraph UK.

"AT A meeting of the national executive committee of the SNP at the end of last week, party figures joked about whether to have a whip-round to help pay for a plane ticket for David Cameron to Scotland, in the hope of getting him up here soon."

Scotland on Sunday.

"“I have a little goatee beard and everybody had a whip-round in the pub to get me to shave it off as well,” said Mr Willingham, who works as a tarmacer."
Suffolk Free Press.

Venezuela: hacer una vaca.

España: hacer un escote.

Foto: Boston.com