Jack of All Trades, Master of None
Often used in negative light to describe someone who can do many different things, but is not particularly good at any one of them.
John is a Jack of all trades, but master of none.
Did you know?
This idiom originated from the Elizabethan era, where the term Johannes factotum (“Johnny do-it-all”) was used. The phrase Jack of all trades became commonly used in the 17th century. ‘Jack‘ was used to replace ‘Johannes’ as it was the more common name for a man