自作聰明

zìzuòcōngmíng

think oneself clever (in making suggestions, etc.); try to be smart (by acting on one's own, etc.)

* * *

zi4 zuo4 cong1 ming2

to think oneself clever (idiom), self-styled genius, a smart aleck

* * *

自作聰明|自作聪明 [zì zuò cōng míng] ► to think oneself clever (idiom) ► self-styled genius ► a smart aleck