Romper una lanza por alguien / algo

to stand up for someone; **to stand up for someone**; **to speak up for someone**; **to defend someone**; **to come to someone's defence**; **to make a case for something**

Romper una lanza por alguien (o por algo) means to defend, support or speak up for someone or something, especially when they are being criticised or treated unfairly.

The speaker actively takes their side.

• defends a colleague
• supports an unpopular opinion
• speaks in favour of a person under criticism
• publicly backs a cause
• argues that someone deserves fairer treatment

The expression comes from medieval jousting tournaments.

Knights fought with wooden lances, which often shattered on impact.

To break a lance for another person meant entering combat to defend that person's honour or cause.

Although the tournaments disappeared centuries ago, the metaphor survived.

Today, the battle is verbal rather than physical.

Spanish speakers often use the expression when introducing a defence of someone who has received criticism.

For example:

Voy a romper una lanza por los profesores.

immediately tells the listener that the speaker is about to defend teachers against criticism.

The expression often introduces an argument rather than merely expressing agreement.

Spanish preserves many expressions from the world of medieval chivalry.

Among them are:

• Romper una lanza por alguien → to defend someone.
• Recoger el guante → to accept a challenge.
• Lanzar un órdago → to make a bold, high-risk move (from the card game mus).

Although their historical origins are centuries old, these expressions remain fully alive in modern Spanish.

Do not translate the expression literally.

English speakers would rarely say:

I'm going to break a lance for him.

Instead, choose expressions such as:

• I'm going to stand up for him.
• I'd like to defend her.
• Let me speak up for them.

The medieval image exists almost exclusively in Spanish.