boom (Noun) — A deep prolonged loud noise.
boom (Noun) — A state of economic prosperity.
boom (Noun) — A sudden happening that brings good fortune (as a sudden opportunity to make money). ex. "the demand for testing has created a boom for those unregulated laboratories where boxes of specimen jars are processed like an assembly line"
boom (Noun) — A pole carrying an overhead microphone projected over a film or tv set.
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.
boom (Noun) — A floating barrier used to obstruct the entry of a harbour, contain oil spills, etc..
boom (Verb) — Make a resonant sound, like artillery. ex. "His deep voice boomed through the hall"
boom (Verb) — Hit hard. ex. "He boomed a 3-run homer"
boom (Verb) — Be the case that thunder is being heard. ex. "Whenever it booms, my dog crawls under the bed"
boom (Verb) — Make a deep hollow sound. ex. "Her voice booms out the words of the song"
boom (Verb) — Grow vigorously. ex. "business is booming"