Verb

• S: (v) boom, din (make a resonant sound, like artillery) "His deep voice boomed through the hall"
• S: (v) smash, nail, boom, blast (hit hard) "He smashed a 3-run homer"
• S: (v) thunder, boom (be the case that thunder is being heard) "Whenever it thunders, my dog crawls under the bed"
• S: (v) boom, boom out (make a deep hollow sound) "Her voice booms out the words of the song"
• S: (v) boom, thrive, flourish, expand (grow vigorously) "The deer population in this town is thriving"; "business is booming"

Adjective

• S: (adj) booming, flourishing, palmy, prospering, prosperous, roaring, thriving (very lively and profitable) "flourishing businesses"; "a palmy time for stockbrokers"; "a prosperous new business"; "doing a roaring trade"; "a thriving tourist center"; "did a thriving business in orchids"
• S: (adj) booming, stentorian ((used of the voice or sound) deep and resonant)