a pound to a penny en · ADV
Meanings
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(UK, idiomatic, not-comparable) Very likely; almost certainly.
"I'll lay you a pound to a penny that proud Miss Nelly marries John Ormandy in the end."
c. 1872, Holme Lee (pseudonym of Harriet Parr), “Too Prudent by Half; or, Proud Nelly Kingsland”, in Country Stories, Old and New. In Prose and Verse, volume 1, Smith, Elder & Co., published 1872, page 265:Mrs. Seaton raised her eyebrows. "What does she think will happen? She might respect what you have to say, but I'll put a pound to a penny no one else at that table will."
2015, Rachel Brimble, chapter 17, in What a Woman Desires, →ISBN, page 160:...and where was out boy? ...Discharged early from the National Service in Cyprus! A pound to a penny he was home with Mum...
2010, P. F Bonneton, The Seeds of Time, →ISBN, page 150:
Synonyms
bet one's boots · bet a dollar to a dime · bet dollars to donuts · take to the bank · bet one's bottom dollar · bet the farm