To back off, to go away, to beat it, to piss off.
Inherited from Ottoman Turkish دفع اولمق (defʿ olmaḳ), from Arabic دَفْع (dafʕ), equivalent to def (“an act of pushing away, repelling, expelling”) + olmak (“to be, to become”).
Oefen met het spreken en memoriseren van " defolmak " en vele andere woorden en zinnen in Turks .