| 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 | - |
| (verb) grow vigorously | Synonyms: expand, flourish, thrive |
| (verb) hit with great force | Synonyms: blast, nail, smash |
| (verb) make a resonant sound, like artillery | Synonyms: din |
| (verb) make a deep hollow sound | Synonyms: boom out |
| (verb) be the case that thunder is being heard | Synonyms: thunder |
| 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 |
| (verb) return to the initial position from where it came; like a boomerang | - |
| booming | (adjective) (used of the voice or sound) deep and resonant | Synonyms: stentorian |
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| (adjective) very lively and profitable | Synonyms: burgeoning, flourishing, palmy, prospering, prosperous, roaring, thriving |