1. 
   Overblow
   O`ver·blow' intransitive verb 1. To blow over, or be subdued. [ R.] Spenser. 2. (Mus.) To force so much wind into a pipe that it produces an overtone, or a note higher than the natural note; thus, the upper octaves of a fl...
   Found op http://www.encyclo.co.uk/webster/O/49
   
   
2. 
   Overblow
   O`ver·blow' transitive verb To blow away; to dissipate by wind, or as by wind. « When this cloud of sorrow's overblown .» Waller.
   Found op http://www.encyclo.co.uk/webster/O/49
   
   
3. 
   Overblow
   • (v. t.) To blow away; to dissipate by wind, or as by wind. • (v. i.) To force so much wind into a pipe that it produces an overtone, or a note higher than the natural note; thus, the upper octaves of a flute are produced by overblowing. • (v. i.) To blow over, or be subdued.
   Found op http://thinkexist.com/dictionary/meaning/overblow/
   
   
4. 
   Overblow
   Generally, to cause a reed to jump an octave by increasing the pressure on it. Some types of bagpipe, particularly the Uilleann pipe, require this technique to achieve the full range of the chanter.
   Found op http://en.wikipedia.org/wiki/Glossary_of_bagpipe_terms
   
   

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