Meaning: Someone who is one over the eight is drunk.
Someone who has had one over the eight is very drunk indeed. It refers to the standard eight pints that most people drink and feel is enough.
Buy our lists of British English, American English and Animal idioms in PDF format. They're perfect to use offline for reference or for use in class!
If you have a question about idioms, ask us about it in our Idioms Discussion Forum.
If you know of an idiom that you would like to be listed here, please use our online form to suggest an idiom.