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high-rise of, concerning, typical of, or being a building that has many stories and elevators. [2 definitions]
highroad a course or direction that is easy or sure.
high school a school consisting of grades nine or ten through twelve or, formerly, grades seven through twelve.
high seas the area of a sea or ocean outside the territorial limit of any country.
high-sounding imposing or impressive-sounding but pretentious.
high-speed designed to travel or operate at higher-than-standard speeds.
high-spirited enthusiastic, fiery, or courageous in temperament or behavior.
high street (chiefly British) the main commercial street of a town where many shops and other businesses are located.
high-strung exceptionally nervous; easily upset; usually tense.
hightail (informal) to flee; run away; leave hurriedly.
hightail it (informal) to move or leave hurriedly.
high-tech see high technology. [2 definitions]
high technology any technology that requires or involves sophisticated techniques or equipment, such as genetic engineering or microelectronics; high-tech.
high-tension possessing or transmitting electricity of high voltage.
high-test of or concerning a high-octane gasoline that has an esp. low boiling point.
high tide the highest point reached by a tide, or the time of day when this occurs. [2 definitions]
high time just the appropriate time, or even past it.
high-toned having an elevated character, morality, or the like; dignified. [2 definitions]
high treason violation of allegiance against one's government, or the crime of giving aid and comfort to the enemies of one's own government.
high water see high tide. [2 definitions]
high-water mark a mark indicating the highest level reached by a body of water. [2 definitions]