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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]
highway a major public road on which one can drive at high speeds, esp. between cities. [2 definitions]
highwayman someone who attacks and robs people along a roadway, esp. in former times.
high wire a cable or tightrope high above the ground, used esp. in circus performance.
hijack to take charge of (an airplane or other vehicle) by force, so as to compel it to go somewhere, to demand ransom, or the like. [5 definitions]
hijinks variant of high jinks.
hike to take a long walk, esp. in the country or through rugged terrain, as for enjoyment, exercise, or training. [6 definitions]