a costa de

at the expense of

→ a
phrase Rare #47,084
at the expense of Often indicates that someone or something benefits while someone or something else suffers or loses out.
SP: No quiero conseguirlo a costa de los demás.
EN: I don’t want to get it at the expense of others.

La gente por lo general se vuelve famosa a costa de su privacidad.

People usually become famous at the expense of their privacy.

La broma fue a costa de Tom.

The joke was at Tom's expense.

Pero no a costa de nuestra causa.

But not at the expense of our cause.

Un programa económico como ese va a ayudar a los ricos a costa de los pobres.

An economic program like that will help the rich at the expense of the poor.