In [[linguistics]], a '''cognate object''' (also known as a '''cognate accusative''' or aan '''internal accusative'''<ref>{{Cite web |title=The Accusative Case {{!}} Department of Classics |url=https://classics.osu.edu/Undergraduate-Studies/Latin-Program/Grammar/Cases/accusative-case |access-date=2024-05-21 |website=classics.osu.edu}}</ref>) is a [[verb]]'s [[object (grammar)|object]] that is etymologically related to the verb. More specifically, the verb is one that is ordinarily [[intransitive]] (lacking any object), and the cognate object is simply the verb's [[noun]] form. For example, in the sentence ''He slept a troubled sleep'', ''sleep'' is the cognate object of the verb ''slept''. This construction also has a passive form. The passive is ''A troubled sleep was slept by him.'' Cognate objects exist in many languages, including various unrelated ones; for example,<ref>[https://linguistlist.org/issues/9/9-1757/ Linguist list]</ref> they exist in [[Arabic]], [[Chichewa language|Chichewa]], [[English language|English]], [[German language|German]], [[Ancient Greek]],<ref>[[Herbert Weir Smyth]]. ''A Greek grammar for colleges''. page 355, section 1563: cognate accusative</ref> [[Hebrew]], [[Icelandic language|Icelandic]], [[Korean language|Korean]], [[Latin]],<ref>Joseph Henry Allen, [[James B. Greenough|James Bradstreet Greenough]]. ''New Latin grammar for schools and colleges''. p. 243, section 390: cognate accusative.</ref> and [[Russian language|Russian]].
