thunderclap

[ thuhn-der-klap ]
/ ˈθʌn dərˌklæp /

noun

a crash of thunder.
something resembling a thunderclap, as in loudness or unexpectedness.

Origin of thunderclap

First recorded in 1350–1400, thunderclap is from the Middle English word thonder clappe. See thunder, clap1
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British Dictionary definitions for thunderclap

thunderclap

/ (ˈθʌndəˌklæp) /

noun

a loud outburst of thunder
something as violent or unexpected as a clap of thunder

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012