■ noun
1》 a loud rumbling or crashing noise heard after a lightning flash due to the expansion of rapidly heated air.
2》 a resounding loud, deep noise.
■ verb
1》 ( it ~s , it is ~ing , etc.) ~ sounds.
2》 move heavily and forcefully.
3》 speak loudly, angrily, and forcefully, especially to protest: he ~ed against the evils of the age.
Derivatives
~er noun
~y adjective
Origin
OE thunor (n.), thunrian (v.), of Gmc origin.