"To stop the alarm" means to turn off or silence a device that is making a loud noise or ringing to get someone's attention or wake them up. Full definition
Before you can talk yourself into a different mindset, you have to first stop the alarm bells in your brain that signal danger. (mindbodygreen.com)
The sector is also in a critical state where only innovative ideas can stop the alarming impact of the fall of oil prices on national income. (nigeriapoliticsonline.com)
Besides you can touch the fingerprint sensor to click a photo / video, answer a call and even stop an alarm. (techpp.com)