"to fall away" in Spanish

CONTEXT EXAMPLES
Context examples for "to fall away" in Spanish(!) These sentences come from external sources & may not be accurate. Therefore, we are not responsible for their content.
Does it not mean that all obstacles fall away of themselves?
¿No significa que todos los obstáculos desaparecerán por sí solos?
That argument might fall away when every currency is called the euro, and no longer the franc, pound, peseta or lira.
Este argumento puede desmoronarse cuando todo el dinero se llame euro y ya no haya francos, libras, pesetas o liras.
to fall away sharply
irse a pique
to fall away
caer en declive
They are more intelligent; they are more hard-working; they can apply themselves and yet, even when they go into higher education, into the start of a research career, they sometimes fall away.
Son más inteligentes; son más trabajadoras; saben ser aplicadas y, sin embargo, aún cuando accedan a la educación superior, al principio de su carrera de investigación, a veces abandonan.