keep shtum

Verb

 * 1)  Not tell anyone; especially, keep silent about something that may be sensitive or secret.
 * 2) * 1996,, , London: , ISBN 978-0-340-68478-8 ; republished New York, N.Y.: , 1997, ISBN 978-0-345-42043-5 , page 104:
 * Charlie Blüthner is the shmatte king of Panama, and he wouldn't be where he is today if Benny hadn't kept shtum for him just like you did for me.
 * Charlie Blüthner is the shmatte king of Panama, and he wouldn't be where he is today if Benny hadn't kept shtum for him just like you did for me.