to thunder is a form of:

Thunder



noun
1.
(UNCOUNTABLE) (the loud noise accompanying lightning, any similar noise) ផ្គរ, ផ្គរលាន់, រន្ទះ
verbpast tense: thundered ; past participle: thundered ; present participle: thundering ;
1.
(INTRANSITIVE) (To roar. -steal someone's thunder to use someone's ideas or inventions without the originator's permission) ផ្គរលាន់, និយាយដូចផ្គរលាន់
Example: The thunder of the enemy's guns, It thundered during the storm, Where have you been? Father thundered, The cannon thundered, Thunder and lightning, The thunder of the guns.
ENGLISH MEANING
noun
1.
The sound which follows a flash of lightning; the report of a discharge of atmospheric electricity.
2.
The discharge of electricity; a thunderbolt.
3.
Any loud noise; as, the thunder of cannon.
4.
An alarming or statrling threat or denunciation.
verbpast tense: thundered ; past participle: thundered ; present participle: thundering ;
1.
To produce thunder; to sound, rattle, or roar, as a discharge of atmospheric electricity; -- often used impersonally; as, it thundered continuously.
2.
(FIGURATIVE) To make a loud noise; esp. a heavy sound, of some continuance.
3.
To utter violent denunciation.
4.
(TRANSITIVE) To emit with noise and terror; to utter vehemently; to publish, as a threat or denunciation.