Today in my mathematics class my lecturer used a phrase I am very familiar with, and I suspect many others may be familiar with too. However, when thinking about how one would write a particular word in this phrase I became perplexed, and am wondering if anyone else knows how to write it.

The phrase is:

"We'll do the final few steps in a one-ner."

The final word is written as it is pronounced. Are others familiar with this word, and does anyone know how it would be written? I doubt it's in the dictionary, but it seems to be a common word (I am Scottish, so perhaps this is a regional question).

Today in my mathematics class my lecturer used a phrase I am very familiar with, and I suspect many others may be familiar with too. However, when thinking about how one would write a particular word in this phrase I became perplexed, and am wondering if anyone else knows how to write it.

The phrase is:

"We'll do the final few steps in a one-ner."

The final word is written as it is pronounced. Are others familiar with this word, and does anyone know how it would be written? I doubt it's in the dictionary (I've checked under multiple potential spellings), but it seems to be a common word (I am Scottish, so perhaps this is a regional question).