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higher-up (informal) someone who occupies an authoritative or relatively high position, as in a business or association.
high explosive an explosive that explodes extremely quickly and powerfully, such as TNT.
highfalutin (informal) ostentatious or pompous; high-flown.
high-fiber of a diet or food substance, containing a high concentration of undigestible plant carbohydrates.
high fidelity a method of sound recording and reproduction that captures and reproduces the entire range of audible frequencies with very little distortion.
highflier a person, aircraft, or other thing that flies high. [2 definitions]
high-flown excessive or extravagant, as in self-esteem, goals, or the like. [2 definitions]
high frequency a radio wave between three and thirty megahertz.
High German the dialects of the German language spoken in the central and southern parts of the country. (Cf. Low German.) [2 definitions]
high-grade of very good or superior quality. [2 definitions]
high-handed arbitrary and domineering in action or manner.
high hat see top hat.
high-hat1 (informal) to treat snobbishly; condescend toward. [2 definitions]
high-hat2 a pair of cymbals mounted on a stand and struck together by means of a foot pedal, used esp. by drummers in jazz and rock bands.
High Holidays in the Jewish calendar, the period including Rosh Hashanah and Yom Kippur.
highjack variant of hijack.
high jinks (informal) boisterous fun, or pranks; rowdiness.
high jump a field event in which contestants jump over a level bar, which is raised after each successful trial.
highland land that is at an elevation; plateau. [3 definitions]
Highland fling a vigorous folk dance of the Scottish Highlands.
high-level of, involving, or being a person or persons of exceptional status or importance. [2 definitions]