In flying we are occasionally assigned to ‘hold’ at designated ‘holding fixes’ along our route of flight. And on Instrument Approaches there are often holding fixes depicted – not always used, but depicted just the same. There are many reasons for ‘holding,’ among them weather delays, congested traffic, priority traffic, etc. This is a typical Holding Fix.
If we are assigned holding, and subsequently cleared to continue on with our flight, we are required to report, “Departing the (holding) Fix” when we actually pass over the designated holding fix.
So, a lot of use the expression “Departing the fix” as an euphemism for leaving where-ever….
(Of interest, I have occasionally seen guys “get lost” in holding! It is an incredible experience to sit through!)