A city and municipality of Bern canton, Switzerland / An Alpine lake, which took its name from the city of Thun, on its northern shore: see Lake Thun.

A lake in the Bernese Oberland, Switzerland, which takes its name from the town of Thun.

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.

A storm consisting of thunder and lightning produced by a cumulonimbus, usually accompanied with heavy rain, wind, and sometimes hail; and in rarer cases sleet, freezing rain, or snow.

(basketball) An extremely forceful dunk.

(informal) A large or dramatic thunderstorm.

A sudden, loud thunder caused by a nearby lightning strike; a shock of thunder, as opposed to a reverberating rumble

(intransitive) To produce a loud burst of sound like a thunderclap.

A flash of lightning accompanied by a crash of thunder. / (figuratively) An event that is terrible, horrific or unexpected.