The phrase "to raise a finger" means to make an effort or take action to help or resolve a problem. It typically implies that someone is being lazy or unwilling to contribute. Full definition
Actions would involve raising the fingers, or using the car to assault others drivers off the road. (wannadrive.com)
I simply raised my finger close to the screen, and I could stop and drag objects floating above it. (tomsguide.com)
Some of the questions are more personal in nature whereas other questions may raise a finger on your efficiency in the profession. (bestsampleresume.com)