The Collaborative International Dictionary of English v.0.48:
High \High\, adv.
In a high manner; in a high place; to a great altitude; to a
great degree; largely; in a superior manner; eminently;
powerfully. "And reasoned high." --Milton. "I can not reach
so high." --Shak.
Note: High is extensively used in the formation of compound
words, most of which are of very obvious signification;
as, high-aimed, high-arched, high-aspiring,
high-bearing, high-boasting, high-browed, high-crested,
high-crowned, high-designing, high-engendered,
high-feeding, high-flaming, high-flavored, high-gazing,
high-heaped, high-heeled, high-priced, high-reared,
high-resolved, high-rigged, high-seated,
high-shouldered, high-soaring, high-towering,
high-voiced, and the like.
High and low, everywhere; in all supposable places; as, I
hunted high and low. [Colloq.]
WordNet (r) 3.0 (2006):
high and low
adv 1: everywhere; "searched high and low"