n. phr. , informal Something to do with what happens; part interest or responsibility. When the girls got up a Christmas party, I felt sure Alice had a finger in the pie. The Jones Company was chosen to build the new hospital and we knew Mr. Smith had a finger in the pie. Jack is a boy with a finger in every pie at school, from dramatics to football.
Compare: HAVE A HAND IN, TOO MANY IRONS IN THE FIRE.