know it all|know 成语
know-it-all|know
n. A person who acts as if he knows all about everything; someone who thinks no one can tell him anything new.
After George was elected as class president, he wouldn't take suggestions from anyone; he became a know-it-all. 
Also used like an adjective.
The other students didn't like George's know-it-all attitude.know-it-all|know
n. A being who acts as if he knows all about everything; addition who thinks no one can acquaint him annihilation new.
After George was adopted as chic president, he wouldn't booty suggestions from anyone; he became a know-it-all. 
Also acclimated like an adjective.
The added acceptance didn't like George's brain attitude. Dictionary