what does "in a oner"mean?
“Mr. Strike, your attitude astounds me. You undertook to repay Mr. Rokeby monthly, and you are now in arrears to the tune of—”
“I can’t pay you what I haven’t got. If you hold tight, I should be able to give you all of it back. Maybe even in a oner.”

Question

Answer

"A oner" can refer to a hundred pounds but that doesn't seem quite right here.

Answer

It's not something I have heard before, but my assumption is that it means 'in a one-off payment' - e.g. he will be repaid the entire sum in one payment.

Đừng bỏ lỡ cơ hội học ngoại ngữ ngay tại nhà. Hãy xem danh sách các gia sư ngôn ngữ giàu kinh nghiệm của chúng tôi và đăng ký buổi học đầu tiên ngay hôm nay!