To chip in (AmE) (informal)
To have a whip-round (BrE) (informal).
Let's chip in and buy a crate of beer.
"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."
"If everyone chips in, we'll be able to buy her a nice leaving present."
Oxford Advanced Learner's Dictionary.
"“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.