COGNATE OBJECT

Cognate object is a form of direct object. It shares the same linguistic root, meaning and form as the verb . 

She smiled a sweet smile

He dreamt a beautiful dream

For a cognate object we must remember the following points:

• Typically the verb of a cognate object is an intransitive verb. 
• Cognate object is the noun form of the verb used. 
• A cognate object acts  adverbially modifying the verb's performance.
• it sits in the noun slot and delivers the power of an adverb
• Use of a cognate object gives the power  to use an adjective instead of an adverb.
• it adds style weight and emphasis to writing