The phrase "pull the trigger" refers to making a decision or taking action that will have a significant and likely irreversible impact. Some synonyms for this phrase include "take the plunge", "make a move", "commit", "act decisively", "seize the moment", "go for it", "take the leap", and "take action". All of these phrases convey a sense of determination, a willingness to take risks, and a recognition that hesitation or delay may result in missed opportunities or potentially negative consequences. Using any of these phrases can help to emphasize the importance of acting decisively and taking responsibility for the outcome of one's actions.