Webster's Revised Unabridged Dictionary · 1913

Overblow

Overblow , intransitive verb

1.
To blow over, or be subdued. [Rare] — Spenser
2.
(Music) 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.

Overblow , transitive verb

1.
To blow away; to dissipate by wind, or as by wind.
When this cloud of sorrow's overblown. — Waller
2.
To ascribe an unwarranted importance to.
3.
(Music) To blow into (a wind instrument) too strongly, so as to produce predominantly overtones.