gaining some knowledge can make a person believe that they have now become experts in that field
this phrase refers to how people behave when they have only some of the knowledge which leads them to act in a way that could be detrimental to them or someone else
a little knowledge misleads people into thinking they can manage more than they actually can
a little learning can be a dangerous thing
He read about the procedure online and thought he doesn’t need the doctor to get it done. Now he will have to stay in the hospital far more than he might have in the first place, a little knowledge is indeed a dangerous thing.
She cut her own fringes and ended up making her face look ridiculous. A little knowledge can be a dangerous thing when dealing with the intricate art of hair cutting.
There is no origin for this idiom
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definition
Common phrase that has a specific meaning.