WordNet Dictionary- [n] an air mass of higher than normal pressure; "the east coast benefits from a Bermuda high"
- [adj] aggressively and persistently persuasive; "a hard-hitting advertising campaign"; "a high-pressure salesman"
Webster's 1913 Dictionary\High"-pres`sure\ (?; 135), a.
1. Having or involving a pressure greatly exceeding that of
the atmosphere; -- said of steam, air, water, etc., and of
steam, air, or hydraulic engines, water wheels, etc.
2. Fig.: Urgent; intense; as, a high-pressure business or
social life.
{High-pressure engine}, an engine in which steam at high
pressure is used. It may be either a condensing or a
noncondensing engine. Formerly the term was used only of
the latter. See {Steam engine}.