oxter

You may have “The Lives of the Poets” under your oxter, young fellow, but you don’t have them in your head, so go home and read.

From The New Yorker ● Feb. 15, 1999

He says, How many Leaders have you under your oxter?

From "Angela's Ashes: A Memoir" by Frank McCourt

As for Peter, who had been getting over his trouble, he saw now for the first time what he had lost, and he carried Betsy's dear letter in his oxter pocket and was inconsolable.

From Sentimental Tommy The Story of His Boyhood by J. M. (James Matthew) Barrie

By your way of it, you're Balfour of the Shaws; but for what I ken you may be Balfour of the Deevil's oxter.

From David Balfour, Second Part Being Memoirs Of His Adventures At Home And Abroad, The Second Part: In Which Are Set Forth His Misfortunes Anent The Appin Murder; His Troubles With Lord Advocate Grant; Captivity On The Bass Rock; Journey Into Holland And France; And Singular Relations With James More Drummond Or Macgregor, A Son Of The Notorious Rob Roy, And His Daughter Catriona by Robert Louis Stevenson

They say he is about to marry the daughter of Leddy Ashton; and let her leddyship get his head ance under her oxter, and see you if she winna gie his neck a thraw.

From The Bride of Lammermoor by Sir Walter Scott