The boss of the failed company is keeping schtum about his role in the disaster.schtumschtum, schtoom, shtum /ʃtʊm/ adjective [not before noun] 
The boss of the failed company is keeping schtum about his role in the disaster.
COLLOCATIONS FROM THE ENTRY The boss of the failed company is keeping schtum about his role in the disaster.
quiet or silent: The boss of the failed company is keeping schtum about his role in the disaster. The boss of the failed company is keeping schtum about his role in the disaster.