blow down

verb5

1. •
   To knock over with an air current, most often wind.

   • I'll huff and I'll puff and I'll blow your house down.
2. •
   To clean off from top to bottom with an air current from a compressed air hose.

   • Blow down this enclosure and do some chip handling before you run this machine any further.
3. •
   Synonym of dirty down.
4. •
   (slang, old-fashioned) To kill (someone) with a gun.
5. •
   (slang, old-fashioned) To signal to someone by blowing into a whistle.