1
general::
Have a share, interest, or involvement in something or someone. For example, Every member had a stake in the business, or She knew that she had a stake in her children's future. This term uses stake in the sense of "something to gain or lose," as in gambling. [Late 1700s]
American Heritage Idioms
2
general::
Phrase(s): have a stake in something
Fig. to have something at risk in something; to have a financial or other interest in something. • I have a stake in that company. I want it to make a profit. • I don’t have a stake in it, so I don’t care.
McGrawhill's American Idioms And Phrasal Verbs