平地一声雷

平地一声雷

Literally means:

sudden clap of thunder

Actually means:

sudden big change; unexpected event

Literally it refers to a sudden clap of thunder. It figuratively means that an unexpected big event occurs. It also means t that one's reputation or status rises out of expectation. It carries a sense of exagreration.

突然响了一声雷。比喻发生意想不到的大事情。也指名声地位突然升高。多指从来不曾想过的事情或事件。含有形象夸张的意味。