dismount from something
to get down from something, such as a horse, bicycle, etc. She dismounted from her horse and fled into the house. Please dismount from the bicycle and wheel it into the shed.
He who rides a tiger is afraid to dismount.
Prov. Sometimes it is more dangerous to stop doing a dangerous thing than it is to continue doing it. Jill: You shouldn't take out another loan. You're already too far in debt. Jane: If I don't take out a loan, I can't make the payments on the loans I already have. You know how it is—she who rides a tiger is afraid to dismount.