rubber room

noun2

1. •
   A cell lined with cushions used for confinement of a mentally disturbed person.

   • "If you kept on worrying about being killed you could end up in a rubber room." — 2002
2. •
   Especially in New York City, a temporary workplace assigned to a teacher who is not permitted to teach in a classroom because he or she is under disciplinary review.

   • The film briefly visits a “rubber room” in New York City where idle teachers accused of misconduct wait months and sometimes years for hearings while drawing full salaries. — 2010