• 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
• a pole carrying an overhead microphone projected over a film or tv set
• a deep prolonged loud noise
• a sudden happening that brings good fortune (as a sudden opportunity to make money); "the demand for testing has created a Boom for those unregulated laboratories where boxes of specimen jars are processed lik an assembly line"
• a state of economic prosperity
• grow stronger; "The economy was Booming"
• hit hard; "He smashed a 3-run homer"
• make a deep hollow sound; "Her voice Booms out the words of the song"
• make a resonant sound, like artillery; "His deep voice Boomed through the hall"
• be the case that thunder is being heard; "Whenever it thunders, my dog crawls under the bed"

'Boom' in other languages