blow down

What precautions should you take to blow down a part of the water in your boiler while running with a good fire?

Well, do not the winds that shriek across this flat country blow down trees sometimes?

The grate is empty now, and lets the freezing draught blow down the chimney.

The window had been shut, so that the wind should not blow down these objects.

Any way, it was obliging enough to blow down a big tree, which fell upon the goat there, and finished her outright.