se déclencher

Ma maladie s'était déclenchée pour la première fois...	It was the first time it happened.
L'alarme s'était déclenchée.	They broke the window, and they set off the alarm.
L'alarme incendie s'était déclenchée et une vague de personnes quittait le bâtiment.	The fire alarm had gone off and a surge of people were leaving the building.

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