You blow behind my back, but dare not say anything to my face.
Bartlett.
To blow hot and cold (a saying derived from a fable of Æsop's), to favor a thing at one time and treat it coldly at another; or to appear both to favor and to oppose. -- To blow off, to let steam escape through a passage provided for the purpose; as, the engine or steamer is blowing off. -- To blow out. (a) To be driven out by the expansive force of a gas or vapor; as, a steam cock or valve sometimes blows out. (b) To talk violently or abusively. [Low] -- To blow over, to pass away without effect; to cease, or be dissipated; as, the storm and the clouds have blown over. -- To blow up, to be torn to pieces and thrown into the air as by an explosion of powder or gas or the expansive force of steam; to burst; to explode; as, a powder mill or steam boiler blows up. "The enemy's magazines blew up." Tatler.
Blow, v. t. 1. To force a current of air upon with the mouth, or by other means; as, to blow the fire.