- 1[intransitive] to make a loud, deep sound Outside, thunder boomed and crashed.
- 2[transitive, intransitive] to say something in a loud, deep voice + speech “Get out of my sight!” he boomed. boom (out) A voice boomed out from the darkness. He had a booming voice. of business/economy
- 3[intransitive] to have a period of rapid growth; to become bigger, more successful, etc. By the 1980s, the computer industry was booming. Business is booming!
make loud soundverbjump to other results
NAmE//bum//Verb Forms present simple I / you / we / they boom
he / she / it booms
past simple boomed
-ing form booming