Léishēng dà, yǔdiǎn xiǎo — tā shuō le hěn duō, dàn shénme dōu méi zuò.
Loud thunder but little rain — he talked a lot but did nothing.
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culture
The idiom 雷声大，雨点小 (léishēng dà, yǔdiǎn xiǎo) — 'loud thunder, small raindrops' — means a lot of talk with little action. It is one of the most common Chinese expressions for overpromising and underdelivering.
