pull the trigger

gravity's pull

Stress or pressure of a situation acting upon a person.

have one's finger on the trigger

To be prepared to kill someone else or as with a firearm.

itchy trigger finger

The metaphorical trigger finger of a person with a tendency or readiness to act in haste or without consideration; a tendency to so act.

pull a face

To make an abnormal facial expression, either intentionally or because of an emotion.

pull a fast one

To carry out a trick or act of deception; to behave contrary to expectations.

pull a lever

To vote.

pull a rabbit out of a hat

To do something surprising and beneficial that is unexpected.

pull ahead

To move into a winning position (e.g. in a race or competition).