Una nueva idea, una canción

A fixed idiomatic phrase used to describe a sustained campaign of harassment or obstruction against a specific person. Slightly stronger in tone than simply 'causar problemas'; it implies deliberate, relentless targeting.

Used to say you trust someone so completely that you would accept all consequences if they turned out to be wrong. Typically used in the negative ('nadie puede poner las manos en el fuego') to warn that no one can be fully certain about another person's integrity.

A fixed prepositional phrase indicating that an action is carried out deliberately without the knowledge or consent of the person referenced. The literal image of 'backs' does not straightforwardly convey the idea of secrecy or betrayal in the same way the phrase does idiomatically.

A threatening fixed expression asserting that the speaker holds leverage or compromising information over the other person. The idiomatic sense of control or blackmail is not derivable from the literal meaning of holding someone in one's hands.