has jammed
Presente perfecto para el sujetohe/shedel verbojam.

jam

Whatever he's doing has jammed the door.
Lo que sea que haya hecho, ha atascado la puerta.
Whatever he's doing has jammed the door.
La caída de energía ha atascado la puerta.
There is, of course, one discordant note: the mechanism for giving the European Union a new formal constitution has jammed.
Naturalmente, hay una nota discordante: se ha atrancado el mecanismo de dar a la Unión Europea una nueva Constitución formal.
Palabra del día
la almeja