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(ˈaɪˌoʊ pə nər)

1. an experience or disclosure that provides sudden enlightenment.
2. a drink of liquor taken very early in the day.
[1810–20, Amer.]
eye′o`pen•ing, adj.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
References in classic literature ?
Clara had a startling eyeopener when, on being suddenly wakened to enthusiasm by a girl of her own age who dazzled her and produced in her a gushing desire to take her for a model, and gain her friendship, she discovered that this exquisite apparition had graduated from the gutter in a few months' time.
It was a real eyeopener and as I listened all I could think about was my nan, Florence, who lives with dementia, She is an 88-year old widow who lives alone."
he price of property in London has always been an eyeopener.
My wife tossed me a lantern," Fee said in an interview Tuesday with the radio show "Calgary Eyeopener." "I popped out of the tent and just started running toward their tent sort of yelling, I'm here!
She said: "I've received a lot of feedback saying that the video was an eyeopener and how people didn't realise how quickly a dog could overheat.
Assistant curator Neil Thomson was pleased with how the day went, saying: "This has been a real eyeopener for many of our visitors today.
'The way Ali Wazir and Mohsin Dawar are playing into the opposition's hands, today's incident is an eyeopener for those opposition parties who speak about a production order for terrorists and demanded they be brought to the National Assembly,' Dr Awan added.
She termed this terror attack an eyeopener for those who were being used by anti-Pakistan groups.
The detail regards the lifetime of the fish and their demise over the last few decades, both the migratory and the resident trout was an eyeopener.
Etches fought in Bulgaria in 2013 and said: "It was a real eyeopener. Put it this way, it's not the sort of place you go on holiday.
And what an eyeopener it was - from the 14-hour flight there "imagining the myriad of ways I might get killed" and the shock of being allocated his own personal security guard at the airport, to the ultra creepy army of phallic voodoo statues that greeted him on the walk up to his hotel.