A "trigger system" refers to a mechanism or process that sets off a specific action or event. It is like a switch that activates or initiates something. Full definition
This then triggers a system - wide immune response, leading to inflammation all over the body and producing obesity by increasing insulin resistance. (myersdetox.com)
It folds down very easily with a simple trigger system, it's got a spacious storage basket underneath, and it has a parent cup holder and an ergonomic handle grip. (tinyfry.com)
A small difference may not trigger the system, but reduces the sensitivity to real pressure loss on the bigger wheel. (mechanics.stackexchange.com)