Squeezing The Trigger Means...

...just that - that you squeeze the trigger. Since you are supposed to operate the trigger with one finger, under normal circumstances, you are supposed to squeeze it with your trigger finger. Did you ever notice though that when some folks learn how to shoot they squeeze not only the trigger but the whole grip of the pistol as if they were trying to squeeze the juice out of a lemon when all they had to do was to slowly bend the index finger back to exert pressure on or squeeze the trigger. Here is a perfect example shown in a gif-file that I am guessing comes from an old movie. That the woman is squeezing like she was squeezing a lemon (or choking the chicken, as I sometimes call it) is readily apparent especially because of the position of her middle finger and thumb. Watch her as she does it, her fingers clench, her arm pushes forward a bit and also moves downward and she even gets her shoulder into it. It is terrible form for actual shooting; but besides being terrible form and plain out ridiculous, I'll admit that it sure looks good for the movies when you combine the look on her face, of pure evil, with it. Then again, maybe that is the look of  well deserved payback being a bitch when you least expected it!

All the best,
Glenn B