de fondo

underlying; long-distance

→ de
phrase Rare #28,364
underlying; long-distance Used for something deep or substantive, and also in sports for long-distance or cross-country events.
SP: Hay un problema de fondo que todavía no hemos resuelto.
EN: There is an underlying problem that we still haven't solved.

Tom a menudo va esquiando de fondo.

Tom often goes cross-country skiing.

Hay algo más de fondo.

There's something more to it.

— Bullet Train (2022)

Hizo todo el trabajo de fondo.

He did all the background work.

Esta mujer no lleva ningún debate de fondo.

This woman isn't engaging in any substantive debate.

— R.A.F. Facción del ejército rojo (2008)

Me han dicho que eres una corredora de fondo muy buena.

I've been told you're a very good long-distance runner.