| boom | (noun) any of various more-or-less horizontal spars or poles used to extend the foot of a sail or for handling cargo or in mooring | - |
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| (noun) a pole carrying an overhead microphone projected over a film or tv set | Synonyms: microphone boom |
| (noun) a deep prolonged loud noise | Synonyms: roar, roaring, thunder |
| (noun) a sudden happening that brings good fortune (as a sudden opportunity to make money) | Synonyms: bonanza, bunce, godsend, gold rush, gravy, manna from heaven, windfall |
| (noun) a state of economic prosperity | - |
| boomer | (noun) a member of the baby boom generation in the 1950s | Synonyms: baby boomer |
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| boomerang | (noun) a miscalculation that recoils on its maker | Synonyms: backfire |
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| (noun) a curved piece of wood; when properly thrown will return to thrower | Synonyms: throw stick, throwing stick |
| jibboom | (noun) a spar that extends the bowsprit | - |
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| keurboom | (noun) tree with odd-pinnate leaves and racemes of fragrant pink to purple flowers | Synonyms: Virgilia capensis, Virgilia oroboides |
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| (noun) fast-growing roundheaded tree with fragrant white to deep rose flowers; planted as an ornamental | Synonyms: Virgilia divaricata |
| naboom | (noun) small tree of dry open parts of southern Africa having erect angled branches suggesting candelabra | Synonyms: cactus euphorbia, Euphorbia ingens |
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