Progress in Chinese starts with characters, then words, finally idioms. Here’s a free look at 「平白無故」 and its explanation.
The featured idiom 「平白無故」 is explained here, including its meaning and how to use it.
Plainly: out of thin air; therefore: reason. Means for no reason.
The Mandarin pronunciation of this idiom is :
píng bái wú gù
while its Cantonese pinyin is :
peng4/ping4 baak6 mou4 gu3
Chinese idioms are incredibly numerous, each carrying a special meaning and usage. This variety is a great reason to study them, and we hope these tools make that easier for you.

