IPA: /ˈθʌndərˌʃaʊər/
KK: /ˈθʌndərˌʃaʊər/
A short rainstorm that happens with thunder and lightning.
The thundershower surprised us during our picnic in the park.
Thundershower → It is formed from "thunder" (from Old English "þunor", meaning a loud noise or rumble) and "shower" (from Old English "scūr", meaning a fall of rain). The word "thundershower" refers to a rain shower accompanied by thunder, combining the elements of loud noise and precipitation.
Imagine a loud noise ('thunder') happening while rain is falling ('shower') — that's what a thundershower is.