A suffix (-at) denoting a pair of an object that is the object of a sentence, no matter what words are used to describe it.
All Nouns: add -at to the end of the noun (remember vowel-combinations with Strong-II and Weak-II nouns!).
If it is a Strong-I noun with identical base and variable vowels, the noun will undergo A-syncope when the dual suffix is added.
Examples:
Amânun kana balkat pâimâ.
“Manwë held the pair of ships with his hands.”
Ammên kâni miyat angê.
“The mother is holding her twins.”
Mîk nâkhi bôrîtad urud-zê.
“the boy is coming to the two rocks at the mountain.”