1.b> 1) (); to mutter to oneself ; to mutter threats at smb. ;
2) / (); ; ; to mutter smth. in one's sleep / ;
3) i> (); to mutter in smb.'s ear / ;
2.b> (against, at) (), ; ; to mutter at / aga-inst / smb. / ;
3.b> / ; thunder muttered among the mountains - .