Blast  —n. 1 strong gust of air. 2 a explosion. B destructive wave of air from this. 3 loud note from a wind instrument, car horn, etc. 4 colloq. Severe reprimand. —v. 1 blow up with explosives. 2 wither, blight (blasted oak; blasted her hopes). 3 (cause to) make a loud noise. —int. Expressing annoyance.  at full blast colloq. At maximum volume, speed, etc. Blast off take off from a launching site. [old english]