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/ðɛəz/ · pronoun
That or those belonging to them; the possessive case of they, used without a following noun..
This luggage is theirs. These passports are also theirs.
Theirs cost a lot more than ours.
That cat of theirs got into our garden again.
The letter had been given to the two Englishmen by a good friend of theirs in London, who had been in America two years previously, and had singled out Mr. J. L. Westgate from the many friends he had left there as the consignee, as it were, of his compatriots.
Let's go over to theirs.
Use theirs when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Theirs means That or those belonging to them; the possessive case of they, used without a following noun..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
This luggage is theirs. These passports are also theirs.
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