Blow1  —v. (past blew; past part. Blown) 1 direct a current of air (at) esp. From the mouth. 2 drive or be driven by blowing (blew the door open). 3 (esp. Of the wind) move rapidly. 4 expel by breathing (blew smoke). 5 sound or be sounded by blowing. 6 (past part. Blowed) slang (esp. In imper.) Curse, confound (i'm blowed if i know; blow it!). 7 clear (the nose) by blowing. 8 puff, pant. 9 slang depart suddenly (from). 10 shatter etc. By an explosion. 11 make or shape (glass or a bubble) by blowing. 12 a melt from overloading (the fuse has blown). B break or burst suddenly. 13 (of a whale) eject air and water. 14 break into with explosives. 15 slang a squander (blew £20). B bungle (an opportunity etc.). C reveal (a secret etc.). —n. 1 act of blowing. 2 a gust of wind or air. B exposure to fresh air.  be blowed if one will colloq. Be unwilling to. Blow a gasket slang lose one's temper. Blow hot and cold colloq. Vacillate. Blow in 1 break inwards by an explosion. 2 colloq. Arrive unexpectedly. Blow a person's mind slang cause to have hallucinations etc.; astound. Blow off 1 escape or allow (steam etc.) To escape forcibly. 2 slang break wind noisily. Blow out 1 extinguish by blowing. 2 send outwards by an explosion. Blow over (of trouble etc.) Fade away. Blow one's top colloq. Explode in rage. Blow up 1 explode. 2 colloq. Rebuke strongly. 3 inflate (a tyre etc.). 4 colloq. A enlarge (a photograph). B exaggerate. 5 colloq. Arise, happen. 6 colloq. Lose one's temper. [old english]