hangs by a thread
Tu empleo pende de un hilo.
Your job is hanging by a thread.
Su vida pende de un hilo.
His life hangs by a thread.
La vida del paciente pende de un hilo.
The patient's life hangs by a thread.
Su coraje pende de un hilo.
His courage hangs by a thread.
— El señor de los anillos: Las dos torres (2002)