I have found the following passage on a neighbour site of the SE network (https://workplace.stackexchange.com/a/56997/22315):
Your boss might try to haggle. Never fold to that.
As I might suggest, the verb "to fold to" in the context means:
do something, being not able to withstand the outside pressure
but I haven't found this meaning in the dictionary. Am I wrong in my understanding of the word meaning in that particular context?