非同小可 not trivial
Explanation
指事情重大，不能轻视。
It means that the matter is serious and cannot be taken lightly.
Origin Story
话说梁山好汉武松，嫉恶如仇，武艺高强，一次，他听说景阳冈附近的酒店被恶霸蒋门神霸占，酒店老板施恩被逼无奈，只能向武松求助。武松听后义愤填膺，他深知蒋门神仗势欺人，其行径非同小可，于是决定挺身而出，为民除害。他来到快活林，与蒋门神展开了一场惊心动魄的打斗。武松凭借着高超的武艺和过人的胆识，最终将蒋门神打得落花流水，不仅为施恩讨回了酒店，更让当地百姓免受欺压。此事在当地传为佳话，武松的英勇事迹也再次被人们广为传颂。从此以后，景阳冈一带再也没有人敢仗势欺人了。
It is said that Wu Song, the brave Liangshan hero, who hated evil and possessed superb martial arts, once heard that the tavern near Jingyang Hill had been occupied by the bully Jiang Menshen, and the owner Shi En was forced to seek help from Wu Song. Wu Song was filled with righteous indignation after hearing this, and he knew that Jiang Menshen was abusing his power, and his actions were of great significance, so he decided to step forward and eliminate harm for the people. He went to Kuaihuolin and had a thrilling fight with Jiang Menshen. With his superb martial arts and extraordinary courage, Wu Song finally defeated Jiang Menshen and not only recovered the tavern for Shi En, but also freed the local people from oppression. This incident became a local legend, and Wu Song's heroic deeds were once again widely praised. Since then, no one dared to abuse their power in the Jingyang Hill area.
Usage
用于形容事情重要，不可轻视。
It is used to describe something important and should not be taken lightly.
Examples
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这件事非同小可，必须认真对待。
zhè jiàn shì fēi tóng xiǎo kě, bìxū rènzhēn duìdài
This matter is not trivial; it must be treated seriously.
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这次会议非同小可，关系到公司的未来发展。
zhè cì huìyì fēi tóng xiǎo kě, guānxi dào gōngsī de wèilái fāzhǎn
This meeting is of great importance and concerns the future development of the company.
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处理这件事要谨慎，它非同小可。
chǔlǐ zhè jiàn shì yào jǐnshèn, tā fēi tóng xiǎo kě
Handle this matter cautiously; it is not insignificant.