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    "source_title": "Encyclopaedia Britannica (1911)",
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    "chunk_id": "1911:boom:1abe49ca5098",
    "title": "BOOM",
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    "verified_text": "boom, a word of teutonic origin (cf. the ger. _baum_, tree, and the eng. _beam_) for a pole, bar or barrier, used especially as a nautical term, for a long spar, used to extend a sail at the foot (main-boom, jib-boom, &c.). the \"boom\" of a cannon (note of a bell, cry of the bittern) is distinct from this, being onomatopoeic. in the sense of a barrier, a boom is generally formed of timber lashed together, or of chains, built across the mouth of a river or harbour as a means of defence. possibly from the metaphor of a breaking boom, and the accompanying rush and roar, or from the rush of rising waters (mingled with the onomatopoeic use), \"boom\" began in america to be used of a sudden \"spurt\" or access of industrial activity, as in the phrase \"a boom in cotton.\" hence the verb \"to boom,\" meaning to advertise or push into public favour.",
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