Definitions of blow:

• noun:   forceful exhalation through the nose or mouth

  Example: "He gave his nose a loud blow"

• noun:   a powerful stroke with the fist or a weapon

  Example: "A blow on the head"

• noun:   street names for cocaine
• noun:   an unpleasant or disappointing surprise
• noun:   an impact (as from a collision)
• noun:   a strong current of air
• noun:   an unfortunate happening that hinders of impedes; something that is thwarting or frustrating
• verb:   spout moist air from the blowhole
• verb:   cause to move by means of an air current
• verb:   cause air to go in, on, or through

  Example: "Blow my hair dry"

• verb:   play or sound a wind instrument
• verb:   make a sound as if blown
• verb:   sound by having air expelled through a tube
• verb:   spend lavishly or wastefully on
• verb:   be blowing or storming
• verb:   burst suddenly
• verb:   free of obstruction by blowing air through

  Example: "Blow one's nose"

• verb:   shape by blowing

  Example: "Blow a glass vase"

• verb:   allow to regain its breath

  Example: "Blow a horse"

• verb:   cause to be revealed and jeopardized

  Example: "The double agent was blown by the other side"

• verb:   exhale hard

  Example: "Blow on the soup to cool it down"

• verb:   lay eggs

  Example: "Certain insects are said to blow"

• verb:   provide sexual gratification through oral stimulation
• verb:   spend thoughtlessly; throw away
• verb:   melt, break, or become otherwise unusable
• verb:   leave; informal or rude

  Example: "Blow now!"

• verb:   be in motion due to some air or water current

  Example: "The leaves were blowing in the wind"

• verb:   make a mess of, destroy or ruin
• verb:   show off
• name:  A surname (rare: 1 in 50000 families; popularity rank in the U.S.: #5240)