1. (

• rumble ,
• rumbling ,
• grumble ,
• grumbling

) a loud low dull continuous noise; "they heard the rumbling of thunder" ;

2. (

• grumble ,
• grumbling ,
• murmur ,
• murmuring ,
• mutter ,
• muttering

) a complaint uttered in a low and indistinct tone ;

1. (

• grumbling ,
• rumbling

) continuous full and low-pitched throbbing sound; "the rumbling rolling sound of thunder" ;