If you then rewind and have Stop up (as suggested above) Then Push (from the definition ? sackbut (ˈsækˌbʌt) — n a medieval form of trombone [C16: from French saqueboute, from Old French saquer to pull + bouter to push
I only know it as an old name for trombone but have discovered it is also a slang name for the male scrotum,so work it out yourself?Surely it could not mean this?