The phrase "pulls the trigger" refers to the action of firing a gunshot from a firearm. However, there are a number of synonyms that can be used to describe this action, depending on the context and the speaker's intent. For example, "squeezes the trigger," "fires the weapon," or "activates the firearm" can all be used as alternatives. Other options might include "discharges the firearm," "commits the act of shooting," or "engages the trigger mechanism". Ultimately, the choice of synonym will depend on the desired tone and level of detail, but there are plenty of options available for writers and speakers who want to avoid repetition or use a more precise term.