Well, these days even dictionaries add entries that would usually be considered false. The so-called modernization of languages.
From www.dictionary.com :
go off
1. To undergo detonation; explode.
2. To make a noise; sound: The siren went off at noon.
3. To leave: Don't go off mad.
4. Informal To adhere to the expected course of events or the expected plan: The project went off smoothly.
Same applies to many other words. E.g. the word Epicentre (Epicenter) means the point above the center of an earthquake, but since the word was used frequently for another use, the dictionary (namely www.dictionary.com) added:
ep·i·cen·ter ( P ) Pronunciation Key (p-sntr)
n.
...
2. A focal point: stood at the epicenter of the international crisis.
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