would leave, would let, would allow, would stop (doing something)
No entiendo por qué Tom dejaría su paraguas en el auto.
I don't understand why Tom would leave his umbrella in the car.
El profesor ha dicho que no te dejaría volver.
The professor said he wouldn't let you come back.
— Los 400 golpes (1959)
Le prometí a los padres que no dejaría de buscar hasta encontrarlos.
I promised the parents that I wouldn't stop looking until I found them.
— Teléfono negro 2 (2025)
Él dijo que luego nos dejaría saber los resultados del examen.
He said he would let us know the test results later.
Si la escuela no fuera obligatoria, dejaría de ir.
If school weren't mandatory, I would stop going.