1. (

• boom ,
• roar ,
• roaring ,
• thunder

) a deep prolonged loud noise ;

2. (

• thunder ,

) a booming or crashing noise caused by air expanding along the path of a bolt of lightning ;

3. (

• big_H ,
• hell_dust ,
• nose_drops ,
• smack ,
• thunder ,
• skag ,
• scag

) street names for heroin ;

1. (

• thunder

) move fast, noisily, and heavily; "The bus thundered down the road" ;

2. (

• thunder ,
• roar ,

) utter words loudly and forcefully; "`Get out of here,' he roared" ;

3. (

• thunder ,
• boom

) be the case that thunder is being heard; "Whenever it thunders, my dog crawls under the bed" ;

4. (

• thunder ,

) to make or produce a loud noise; "The river thundered below"; "The engine roared as the driver pushed the car to full throttle" ;