The form of the possessive their used alone without a following noun.

Poss. of THEY.

pron. Of them.

Possessive case of THEY.

Possessive of They.

Besides, I have a great desire to witness their proceedings at this temple of theirs. – The Coral Island by R.M. Ballantyne

No father could claim the gratitude of his child so completely as I should deserve theirs. – Frankenstein or The Modern Prometheus by Mary Wollstonecraft (Godwin) Shelley

And now she remembered vaguely that the neighbors had said how strange it was that her father's stock had not suffered as theirs had. – Openings in the Old Trail by Bret Harte

I had your life to think of- And theirs. – The Motor Maid by Alice Muriel Williamson and Charles Norris Williamson

Then, seeing that the matter was urgent and that it was a question of my life or theirs, I came into action. – Child of Storm by H. Rider Haggard

What a life is theirs! – The Glow-Worm and Other Beetles by Jean Henri Fabre

It was my fault, not theirs. – The Captives by Hugh Walpole

As we watched the coming and going of the vessels we thought of the many experiences that must have been theirs! – See America First by Orville O. Hiestand

Her own danger was well- nigh forgotten in theirs. – Elsie at Nantucket by Martha Finley

It was the Church of England itself to Dolly and George Vanborough in those early church- going days of theirs. – Old Kensington by Miss Thackeray

Some of the girls had money, but those of us who were poor couldn't dress like them, and we hadn't well- kept hands like theirs. – Look Back on Happiness by Knut Hamsun

For, as hath been said before, it is the property of the true followers of Christ, to deny themselves, to hate themselves, to despise themselves, and to renounce all that is theirs, for his sake. – True Christianity by Johann Arndt

She wanted like anything to show them devotion and, most frightfully, to receive from them signs of devotion to her- to be able to feel she was theirs, and they hers. – This Freedom by A. S. M. Hutchinson

You must spare them- spare the Rangars- spare every man on this hill, and theirs, and all they have!" – Rung Ho! by Talbot Mundy

Our next man was better than theirs, they said, and they were anxious that we should take our second best, to which our men would not agree. – The Fixed Period by Anthony Trollope

Theirs was a type that the caballeros and senoritas did not know. – Soldiers of Fortune by Richard Harding Davis

But Malcolm was interested after a different fashion from theirs. – The Marquis of Lossie by George MacDonald

But these men he had lived and suffered with, they all wanted to talk the next move over- not his, theirs- all except the Boy, it seemed. – The Magnetic North by Elizabeth Robins (C. E. Raimond)

" You may well be," said a third voice, as another step joined theirs. – What Answer? by Anna E. Dickinson

Yet I, too, surely had a home in an unknown somewhere, and these men were fighting for my home as well as theirs; if I could not fight for a home of my own, I could fight for the homes of my friends. – Who Goes There? by Blackwood Ketcham Benson