set off

Entry Definition
s/he sets it off, trips it (e.g., mousetrap)
s/he sets off or trips something belonging to h/ (e.g., mousetrap)
s/he triggers it or sets it off with foot (e.g., trap)
s/he triggers or sets off with foot something belonging to h/
s/he sets it off or trips it by grabbing it (e.g., sets off mousetrap when feeling around in dark)