The loud rumbling, cracking, or crashing sound caused by expansion of rapidly heated air around a lightning bolt. / A deep, rumbling noise resembling thunder.

(impersonal) To produce thunder; to sound, rattle, or roar, as a discharge of atmospheric electricity. / (intransitive) To make a noise like thunder.

present participle of thunder

Of, pertaining to, or accompanied by thunder. / Producing a noise or effect like thunder; thunderous. / (colloquial) Very great; extraordinary.

A loud percussive sound, like thunder. / (archaic) A thunderstorm.

Very loud; that sounds like thunder; thundersome. Also in metaphorical expressions, signifying fury.

simple past tense and past participle of thunder

(US, colloquial) An exclamation of surprise, agitation or petulance.

(US, colloquial) In any set of circumstances whatsoever.

(Britain, informal) The Times newspaper.