• 01.121 out-of-pocket expenses,

The completely unhyphenated entry in OED startled me with its limited “run out of funds” meaning and not the one that I thought was meant here.  Merriam-Webster came to the rescue with

requiring an outlay of cash  – “out-of-pocket expenses”

with a first-published date of 1885.

“out-of-pocket, adj.” Merriam-Webster, Merriam-Webster.com, https://www.merriam-webster.com/dictionary/out%20of%20pocket.  Accessed 19 September 2017.

“pocket, n. and adj.” OED Online, Oxford University Press, June 2017, http://www.oed.com/view/Entry/146402. Accessed 19 September 2017.