High  —adj. 1 a of great vertical extent (high building). B (predic.; often in comb.) Of a specified height (one inch high; waist-high). 2 a far above ground or sea level etc. (high altitude). B inland, esp. When raised (high asia). 3 extending above the normal level (jersey with a high neck). 4 a of exalted quality (high minds). B lavish; superior (high living; high fashion). 5 of exalted rank (high society; is high in the government). 6 a great; intense; extreme; powerful (high praise; high temperature). B greater than normal (high prices). C extreme or very traditional in religious or political opinion (high tory). 7 performed at, to, or from a considerable height (high diving; high flying). 8 (often foll. By on) colloq. Intoxicated by alcohol or esp. Drugs. 9 (of a sound etc.) Of high frequency; shrill. 10 (of a period, age, time, etc.) At its peak (high noon; high summer; high renaissance). 11 a (of meat etc.) Beginning to go bad; off. B (of game) well-hung and slightly decomposed. —n. 1 high, or the highest, level or figure. 2 area of high pressure; anticyclone. 3 slang euphoric state, esp. Drug-induced (am on a high). —adv. 1 far up; aloft (flew the flag high). 2 in or to a high degree. 3 at a high price. 4 (of a sound) at or to a high pitch.  high opinion of favourable opinion of. On high in or to heaven or a high place. On one's high horse colloq. Acting arrogantly. [old english]