| high | (noun) a forward gear with a gear ratio that gives the greatest vehicle velocity for a given engine speed | Synonyms: high gear |
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| (noun) a lofty level or position or degree | - |
| (noun) a public secondary school usually including grades 9 through 12 | Synonyms: high school, highschool, senior high, senior high school |
| (noun) a high place | Synonyms: heights |
| (noun) an air mass of higher than normal pressure | - |
| (noun) a state of altered consciousness induced by alcohol or narcotics | - |
| (noun) a state of sustained elation | - |
| highball | (noun) a mixed drink made of alcoholic liquor mixed with water or a carbonated beverage and served in a tall glass | - |
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| highbinder | (noun) a corrupt politician | - |
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| highboard | (noun) a high diving board | - |
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| highboy | (noun) a tall chest of drawers divided into two sections and supported on four legs | Synonyms: tallboy |
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| highbrow | (noun) a person of intellectual or erudite tastes | - |
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| highchair | (noun) a chair for feeding a very young child; has four long legs and a footrest and a detachable tray | Synonyms: feeding chair |
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| highflier | (noun) a person of great ability and ambition | Synonyms: highflyer |
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| highflyer | (noun) a person of great ability and ambition | Synonyms: highflier |
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| highjack | (noun) seizure of a vehicle in transit either to rob it or divert it to an alternate destination | Synonyms: hijack |
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| highjacker | (noun) a holdup man who stops a vehicle and steals from it | Synonyms: highwayman, hijacker, road agent |
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| (noun) someone who uses force to take over a vehicle (especially an airplane) in order to reach an alternative destination | Synonyms: hijacker |
| highjacking | (noun) robbery of a traveller or vehicle in transit or seizing control of a vehicle by the use of force | Synonyms: hijacking |
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| highland | (noun) elevated (e.g., mountainous) land | Synonyms: upland |
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| highlife | (noun) the activity of excessive spending | Synonyms: extravagance, high life, lavishness, prodigality |
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| highlight | (noun) an area of lightness in a picture | Synonyms: highlighting |
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| (noun) the most interesting or memorable part | Synonyms: high spot |
| highlighter | (noun) a fluorescent marker used to mark important passages in a text | - |
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| (noun) a cosmetic used to highlight the eyes or cheekbones | - |
| highlighting | (noun) an area of lightness in a picture | Synonyms: highlight |
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| highness | (noun) the quality of being high or lofty | Synonyms: loftiness |
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| (noun) a high degree (of amount or force etc.) | - |
| highroad | (noun) a highway | Synonyms: trunk road |
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| highschool | (noun) a public secondary school usually including grades 9 through 12 | Synonyms: high, high school, senior high, senior high school |
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| highwater | (noun) the tide when the water is highest | Synonyms: high tide, high water |
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| highway | (noun) a major road for any form of motor transport | Synonyms: main road |
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| highwayman | (noun) a holdup man who stops a vehicle and steals from it | Synonyms: highjacker, hijacker, road agent |
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