Definition of overblow:
(v) :
(transitive) To exaggerate the significance of something.
(v) :
(transitive) To blow away; dissipate by or as by wind.
(v) :
(transitive) To cover with blossoms or flowers.
(v) :
(transitive) To blow over or across.
(v) :
(transitive, music) To blow a wind instrument (typically a whistle, recorder or flute) hard to produce a higher pitch than usual.
(v) :
(intransitive, music) Of a wind instrument, to move from its lower to its higher register.