thunder thunder /ˈθʌndɝ/

noun

1. () A deep prolonged loud noise  ( boom , roaring , thunder , roar )
   a deep prolonged loud noise
     The lion's powerful roar echoed through the savannah.
   The lion's powerful roar echoed through the savannah.
   
2. () A booming or crashing noise caused by air expanding along the path of a bolt of lightning  ( thunder )
   a booming or crashing noise caused by air expanding along the path of a bolt of lightning
    The loud sound of thunder could be heard as the storm approached
   The loud sound of thunder could be heard as the storm approached
   
   
3. Street names for heroin  ( big H , hell dust , nose drops , scag , skag , smack , thunder )
   street names for heroin
   

verb

1. () Move fast, noisily, and heavily  ( thunder )
   move fast, noisily, and heavily
    The bus thundered down the road
   The bus thundered down the road
   
2. () Utter words loudly and forcefully  ( thunder , roar )
   utter words loudly and forcefully
    Get out of here,' he roared
   Get out of here,' he roared
   
3. To make or produce a loud noise  ( thunder )
   to make or produce a loud noise
    The river thundered below
   The river thundered below
    The engine roared as the driver pushed the car to full throttle
   The engine roared as the driver pushed the car to full throttle
   
4. Be the case that thunder is being heard  ( boom , thunder )
   be the case that thunder is being heard
    Whenever it thunders, my dog crawls under the bed
   Whenever it thunders, my dog crawls under the bed