Grammar. a substantive functioning as the object of a verb, especially of a verb that is usually intransitive, when both object and verb are derived from the same root. Speech in Speak the speech is a cognate object.
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How to use cognate object in a sentence
The intransitive form derives from the transitive by dropping a generalized, customary, reflexive or cognate object.Instigations | Ezra Pound
The object of a verb may be the direct object, the predicate objective, the indirect object, the cognate object.
A noun in this construction is called the cognate object of the verb and is in the objective case.
The simple predicate may be modified by a cognate object or by a phrase containing such an object ( 108).
In the first sentence, the cognate object (daggers) modifies the predicate verb (looked) as the adverb angrily would do.