This is the 10643rd most frequent Portuguese word.
gatilho
Trigger.
In this sentence, 'gatilho' is used metaphorically to refer to something that activates or sets off a reaction, in this case, anxiety.
O som alto na rua foi um gatilho para sua ansiedade.
The loud sound on the street was a trigger for her anxiety.
Here, 'gatilho' is used literally to denote the trigger mechanism of a firearm.
Puxe o gatilho da arma com cuidado.
Pull the gun's trigger carefully.
In this context, 'gatilho' symbolizes an event that causes or motivates subsequent actions, like initiating changes.