be able to count somebody/something on (the fingers of) one hand = used to say that the total number of someone or something is very small
She could count on the fingers of one hand the people she actually enjoyed being with.
burn your fingers, get your fingers burned = to suffer as a result of doing something without realizing the possible bad results, especially in business
He really got his fingers burned dabbling in the stock market.
cross your fingers = to hope that your plans will be successful (sometimes putting one finger across another as a sign of hoping for good luck)
I'm crossing my fingers that my proposal will be accepted.
Keep your fingers crossed!
the finger of suspicion = if the finger of suspicion points or is pointed at someone, they are suspected of having committed a crime, being responsible for something, etc.
give somebody the finger (informal) = to raise your middle finger in the air with the back part of your hand facing someone, done to be rude to someone or to show them that you are angry
have a finger in every pie (informal) = to be involved in a lot of different activities and have influence over them, especially when other people think that this is annoying
have/keep your finger on the pulse (of something) =
to always be aware of the most recent developments in a particular situation
have sticky fingers (informal) = to be likely to steal something
lay a finger on somebody = (usually used in negative sentences) to touch someone with the intention of hurting them physically
I never laid a finger on her.
If you lay a finger on me, I'll call the police.
let something slip (through your fingers) = to miss or fail to use an opportunity
Don't let the chance to work abroad slip through your fingers.
not lift a finger (to do something) (informal) = to do nothing to help someone
The kids never lift a finger to help around the house.
not put your finger on something = to not be able to identify what is wrong or different about a particular situation
There was something odd about him but I couldn't put my finger on it.
point the/a finger (at somebody) = to accuse someone of doing something
We often point the finger at someone else when things go wrong.
The article points an accusing finger at the authorities.
snap your fingers = to make a sharp noise by moving your second or third finger quickly against your thumb, to attract someone's attention, or to mark the beat of music, for example
He snapped his fingers for the waiter to bring more wine.
work your fingers to the bone = to work very hard